HELIX M SIX DSP - Receiver Audiotec Fischer - Free user manual and instructions

Product Type	6-channel DSP Amplifier / Digital Signal Processor
Dimensions (H x W x D)	50 x 320 x 154 mm (2.00 x 12.60 x 6.06 inches)
Power Output (RMS @ 4 Ohm)	6 x 100 Watts
Power Output (RMS @ 2 Ohm)	6 x 100 Watts
Bridged Power (RMS @ 4 Ohm)	3 x 200 Watts
Max Power per Channel	Up to 130 Watts RMS @ 4/2 Ohms (multi-channel typical)
Amplifier Technology	Class D
Inputs	6 x RCA/Cinch, 6 x Highlevel Speaker, 1 x Optical SPDIF (12-96 kHz), 1 x Remote In
Outputs	6 x Speaker Output, 4 x RCA/Cinch (Line Out), 2 x Remote Out
DSP Processing	64-bit / 295 MHz, Sampling Rate 48 kHz
Frequency Response	20 Hz - 22,000 Hz
Signal-to-Noise Ratio (A-weighted)	Digital Input: 105/108 dB (Speaker/Line), Analog Input: 102/105 dB
Distortion (THD)	< 0.03% (Speaker), < 0.005% (Line Output)
Damping Factor	100
Operating Voltage	10.5 - 16 Volts (down to 6 Volts for max. 5 seconds)
Current Consumption (Max)	80 A @ 12 V
Idle Current	1950 mA
Fuse Rating	2 x 35 A LP-Mini-Fuse (APS)
Remote Output Voltage (Max)	500 mA
Special Features	ADEP.3 Circuit, Auto Remote Switch, 32 Bit CoProcessor, Control Input, Virtual Channel Processing, Augmented Bass Processing, RealCenter, ClarityXpander, Power Save Mode, Start-Stop Capability
Safety & Protection	Over-temperature, Over/Under-voltage, Short-circuit protection; Fuse Replacement Only With Identical Rating
Maintenance	No user-serviceable parts; cleaning with dry cloth; software updates via DSP PC-Tool; repair by authorized HELIX dealer only
Warranty	Statutory warranty; excludes damage from overload or mishandling; return requires proof of purchase and error description
Certification	CE marked for use in EU vehicles

Frequently Asked Questions - HELIX M SIX DSP Audiotec Fischer

What is the power output of the HELIX M SIX DSP?

The amplifier delivers 6 x 100 Watts RMS at both 4 and 2 Ohms, and 3 x 200 Watts RMS in bridged mode at 4 Ohms. Maximum output can reach up to 130 Watts per channel under typical multi-channel conditions.

How do I adjust the input sensitivity?

Input sensitivity can be adjusted via the DSP PC-Tool software under the 'Signal Management' tab > 'Main Input' > 'Input Gain'. For Highlevel Inputs, the range is 5 - 20 Volts RMS; for Line Inputs (RCA/Cinch), it is 1 - 4 Volts RMS. Factory default is 20V (Highlevel) and 4V (Line). Always match the sensitivity to your source to avoid damage.

How do I enable Virtual Channel Processing (VCP)?

VCP must be enabled in the DCM menu of the DSP PC-Tool software. Navigate to 'Device Configuration Menu' > 'Virtual Channel Processing' and click the VCP graphic to activate it. After activation, you can route inputs to virtual channels and then to outputs for advanced sound tuning.

Can I use the optical digital input?

Yes, the Optical Input accepts SPDIF stereo signals with sampling rates from 12 to 96 kHz. Note: it only handles uncompressed PCM, not Dolby coded streams. Volume control requires an optional remote control (e.g., DIRECTOR, CONDUCTOR, or WIFI CONTROL) or you can enable automatic signal detection in the DCM menu.

What is ADEP.3 and how do I configure it?

ADEP.3 (Advanced Diagnostics Error Protection, 3rd Gen) prevents error messages and feature loss when connecting to modern OEM radios. Configuration is in the DCM menu under 'ADEP.3 Configuration'. If you experience distortion at high volume, try adjusting the compatibility mode. Default is disabled.

How do I bridge channels for subwoofer use?

Bridged mode is achieved by connecting the positive speaker wire to the positive terminal of one channel and the negative wire to the negative terminal of the paired channel. For example, channels A and B can be bridged. Ensure the combined impedance is at least 4 Ohms. The exact pairing is shown in the DSP PC-Tool software.

What does the Power Save Mode do?

Power Save Mode reduces power consumption when no input signal is present for more than 60 seconds (adjustable). It turns off the remote output, thus shutting down connected amplifiers. The mode reactivates within a second upon signal detection. It can be deactivated or its delay time changed via the DSP PC-Tool software.

How do I update the firmware?

Firmware updates are performed automatically when you connect the amplifier to your PC via USB and start the DSP PC-Tool software. If the installed OS is outdated, the software will prompt you to update. Always download the latest software from www.audiotec-fischer.com.

What maintenance does the amplifier require?

The HELIX M SIX DSP requires minimal maintenance. Keep it dry and well-ventilated. Clean the exterior with a dry cloth. Fuses (2 x 35A LP-Mini) can be replaced only with identical type. Do not open the unit; any repairs must be performed by an authorized HELIX dealer.

How do I safely install the amplifier?

Disconnect the vehicle's battery negative terminal first. Mount the amplifier in a dry, well-ventilated location. Use correct wire gauge (min. 10 mm²/AWG 8 for power and ground). Install a main fuse within 30 cm (12 inches) of the battery. Ensure no sharp edges or moving parts near cables. For detailed steps, refer to the user manual.

USER MANUAL HELIX M SIX DSP Audiotec Fischer

Exterior view of a black M-SIX DSP module with visible branding and ports (no text beyond branding)

M SIX DSP

6-channel amplifier with integrated DSP

Close-up of black and white cables with connectors, no visible text or symbols

Kanal A = Vorne links

Kanal C = Hinten links

Signal processing flowchart showing connections between Front, Rear, and Subwoofer stages with SFX-Front Processing and Summen-signal A bis D outputs.

Konfiguration des Virtual Channel Processing (VCP)

Konfiguration des Virtual Channel Processing (VCP)

Remote Output Configuration

ADEP.3 Configuration

ACO – Advanced 32 Bit CoProcessor

- @ 4 Ohm....6 x 100 Watt

- @ 2 Ohm....6 x 100 Watt

32 Bit CoProcessor, Control Input

Abmessungen (H x B x T) 50 x 320 x 154 mm

Congratulations on your purchase of this innovative and high-qual ity HELIX product.

Thanks to more than 30 years of experience in research and development of audio products the HELIX M SIX DSP sets new standards in the range of digital amplifiers.

We wish you many hours of enjoyment with your new HELIX M SIX DSP.

Yours,

AUDIOTEC FISCHER

General instructions

General installation instructions for HELIX components

To prevent damage to the unit and possible injury, read this manual carefully and follow all installation instructions. This product has been checked for proper function prior to shipping and is guaranteed against manufacturing defects.

Before starting your installation, disconnect the battery's negative terminal to prevent damage to the unit, fire and / or risk of injury. For a proper performance and to ensure full warranty coverage, we strongly recommend to get this product installed by an authorized HELIX dealer.

Install your HELIX M SIX DSP in a dry location with sufficient air circulation for proper cooling of the equipment. The amplifier should be secured to a solid mounting surface using proper mounting hardware. Before mounting, carefully examine the area around and behind the proposed installation location to insure that there are no electrical cables or components, hydraulic brake lines or any part of the fuel tank located behind the mounting surface. Failure to do so may result in unpredictable damage to these components and possible costly repairs to the vehicle.

General instruction for connecting the HELIX M SIX DSP amplifier

The HELIX M SIX DSP amplifier may only be installed in vehicles which have a 12 Volts negative terminal connected to the chassis ground. Any other system could cause damage to the amplifier and the electrical system of the vehicle.

The positive cable from the battery for the complete system should be provided with a main fuse at a distance of max. 30 cm from the battery. The value of the fuse is calculated from the maximum total current input of the car audio system.

Use only suitable cables with sufficient cable cross-section for the connection of HELIX M SIX DSP. The fuses may only be replaced by identically rated fuses (2 x 35 A) to avoid damage of the amplifier.

Prior to installation, plan the wire routing to avoid any possible damage to the wire harness. All cabling should be protected against possible crushing or pinching hazards. Also avoid routing cables close to potential noise sources such as electric motors, high power accessories and other vehicleharnesses.

① Control pushbutton

Use this button to either switch between the setups or initiate a reset of the device.

② Rem. Out

The remote output has to be used to turn on / off external amplifiers that are connected to the RCA / Cinch line outputs.

③ Highlevel Input

Highlevel speaker inputs for connecting a factory radio or an aftermarket radio without lowlevel line outputs.

④ Line Input

RCA / Cinch inputs for connecting pre-amplifier signals.

⑤ USB Input

Connects the HELIX M SIX DSP to your PC.

⑥ Status LED

This LED indicates the operating mode of the amplifier and of its memory.

⑦ Control Input

Multifunction interface for e.g. an optional remote control or other HELIX accessory.

⑧ Optical Input

Optical input for digital stereo signals (SPDIF format).

⑨ Line Output

Line outputs for connecting external amplifiers. Make sure that the remote output (Rem. Out) is used to turn on these devices.

10 Power & Protect LED

This LED indicates the operating mode of the amplifier.

⑪ Speaker Output

Speaker outputs for connecting speaker systems.

12 Auto Remote

This switch allows to activate / deactivate the automatic turn-on feature of the Highlevel Input.

⑬ +12 V

Connector for the +12 V power cable to the positive terminal of the battery.

14 REM

Connector for the remote cable of the radio.

15 GND

Connector for the ground cable (negative terminal of the battery or metal body of the vehicle).

Initial start-up and functions

① Control pushbutton

The M SIX DSP provides 10 internal memory locations for sound setups. The Control pushbutton allows the user to switch between two memory positions. These can be defined in the DSP PC-Tool.

1. Setup switch: Press Control pushbutton for 1 second. The memory locations one and two are defined ex works. Switching is indicated by a single red flash of the Status LED. Alternatively, the optional URC.3 remote control can be used for switching. To switch between all internal memory locations, we recommend to use the optionally available remote controls DIRECTOR and CONDUCTOR or the HELIX WIFI CONTROL.

2. Device reset: Press pushbutton for five seconds. This completely erases the internal memory and is indicated by a continuous red glowing and constant green flashing of the Status LED.

Attention: After erasing the setups from memory the M SIX DSP will not reproduce any audio output until the device is updated via the DSP PC-Tool software.

② Rem. Out

We strongly recommend to use this outputs for turning on / off additional amplifiers that are connected to the Line Output of the HELIX M SIX DSP. This is essential to avoid any interfering signals. This output is activated automatically as soon as the booting process of the DSP is completed. Additionally this output will be turned off during the “Power Save Mode” or a software update process.

③ Highlevel Input

6-channel highlevel loudspeaker input to connect the amplifier directly to loudspeaker outputs of OEM / aftermarket radios or OEM amplifiers that do not have any pre-amplifier outputs. Input sensitivity is factory-set to 20 Volts.

It is possible to optimally adapt the input sensitivity to the signal source using the DSP PC-Tool software. The control range of the Highlevel Input is 5 - 20 Volts RMS. The function can be found in the

"Signal management" tab of the DCM menu: "Main Input → Input Gain".

Important: It is mandatory to properly adapt the input sensitivity of the M SIX DSP to the signal source before first use. Disregarding this may cause severe damage to the amplifier.

Attention: Solely use the pluggable screw-terminals for the highlevel connectors which are included in delivery or an optional available cable harness from the HELIX accessory assortment!

④ Line Input

6-channel pre-amplifier input to connect signal source es such as radios. Input sensitivity is factory-set to 4 Volts.

It is possible to optimally adapt the input sensitivity to the signal source using the DSP PC-Tool software. The control range of the Line Input is 1 - 4 Volts RMS. The function can be found in the "Signal management" tab of the DCM menu: "Main Input → Input Gain".

Important: It is mandatory to properly adapt the input sensitivity of the M SIX DSP to the signal source before first use. Disregarding this may cause severe damage to the amplifier.

⑤ USB Input

Connect your personal computer to the M SIX DSP using the provided USB cable. The required PC software to configure this amplifier can be downloaded from the Audiotec Fischer website www.audiotec-fischer.com.

Please note: It is not possible to connect any USB storage devices.

Status LED

The Status LED indicates the operating mode of the DSP.

Green: DSP is ready for operation.

Orange: Power Save Mode is active.

Red: Protection Mode is active. The HELIX M SIX DSP is equipped with a protection circuit against overheating. Please check the thermal installation conditions of the amplifier and observe the general installation instructions on page 23.

If the amplifier is overheated the internal temperature protection switches off the remote and signal output until it reaches a safe temperature level again.

Red / green slow flashing: No operating software installed. Connect the amplifier to the DSP PC-Tool software and confirm the automatic update of the operating system. You will find the latest version of the DSP PC-Tool software at www.audiotec-fischer.com.

Red / green fast flashing: The currently selected sound setup memory is empty. A new setup has to be loaded via the DSP PC-Tool software or switch to a memory position with existing sound setup.

Control Input

This multi-functional input is designed for HELIX M SIX DSP accessory products like a remote control which allows to adjust several features of the amplifier. Depending on the type of remote control, at first its functionality has to be defined in the “Device Configuration Menu” (DCM) of the DSP PC-Tool software or on the control itself.

Optical Input

Optical input in SPDIF format for connecting signal sources with a digital audio output. The sampling rate of this input must be between 12 and 96 kHz. The input signal is automatically adapted to the internal sample rate. In order to control the volume of this input, we recommend to use an optional remote control or the WIFI CONTROL.

In addition, the DSP PC-Tool also offers the option

to automatically activate this input via signal detection as soon as a music signal is detected to the Optical Input.

Note: This amplifier can only handle stereo input signals and no Dolby-coded digital audio stream!

Note: In standard configuration the manual activation via an optional remote control is configured.

Line Output

Processed 4-channel pre-amplifier output with a maximum output voltage of 6 Volts for connecting additional power amplifiers. Please make sure that you always turn on / off external amplifiers using the remote output (Rem. Out) of the M SIX DSP. Never directly control the external amps by a signal from the ignition switch of your car! Additionally this output will be turned off when the "Power Save Mode" of the amplifier is active. The outputs can be assigned to any of the inputs as desired using the DSP PC-Tool software.

Attention: Solely use the provided Line Output-to-RCA / Cinch cable for the connection which is included in delivery (see page 28, fig. 1).

Power & Protect LED

The power and protect LED indicates the operating mode of the amplifier.

Green: The amplifier is ready for operation.

Red:

A malfunction has occurred. The HELIX M SIX DSP is equipped with a protection circuit against over- and undervoltage. Please check for connecting failures such as short-circuits, wrong connections, wrong adjustments and over temperature. If the amplifier does not turn on it is defective and has to be sent to your local authorized dealer for repair service. A detailed description of the malfunction and the purchase receipt has to be attached.

⑪ Speaker Output

Speaker outputs to connect speaker systems. The impedance of each channel must not be less than 2 Ohms (4 Ohms in bridged mode).

Important: We highly recommend to make the general settings in the DSP PC-Tool software before the first start-up. Especially if the M SIX DSP will be used to drive fully active speaker systems, a wrong setup can destroy your tweeters right away.

12 Auto Remote

The M SIX DSP will be turned on automatically if the Highlevel Input is used or if a signal is applied to the remote input (REM) terminal. The Auto Remote switch allows to activate / deactivate the automatic turn-on feature of the highlevel inputs. The feature should be deactivated (Auto Remote = Off) if there are e.g. disturbing noises while switching on / of the amplifier.

Note: The automatic turn-on feature of the highlevel inputs is activated ex works (Auto Remote = On).

Note: If the automatic turn-on function is deactivated it is mandatory to use the remote input to power up the amplifier! The highlevel signal will be ignored in this case.

⑬ + 12 V

Connect the +12 V power cable to the positive terminal of the battery. Recommended cross section: min. 10 mm ^4 / AWG 8.

14 REM

The remote input has to be used to turn on / off the M SIX DSP if the signal source which is connected to the Highlevel Input is not activating the “automatic turn-on” function or if the amplifier shall only be activated / deactivated by a remote signal applied to the remote input. The remote lead should be connected to the remote output / automatic antenna (aerial positive) output of the head unit / car radio. This is only activated if the head unit is switched on. Thus the amplifier is switched on and off together with the head unit. This input needn’t to be assigned if the Highlevel Input is used. To deactivate the “automatic turn-on” function read the description on page 27, item 12; Auto Remote.

15 GND

The ground cable should be connected to a common ground reference point (this is located where the negative terminal of the battery is grounded to the metal body of the vehicle) or to a prepared metal location on the vehicle chassis i.e. an area which has been cleaned of all paint residues. Recommended cross section: min. 10 mm ^2 / AWG 8.

Fig. 1: Line Output-to-RCA / Cinch cable

Close-up of black and white audio/video cables with connectors, no visible text or symbols

Connection of HELIX M SIX DSP to the head unit / car radio:

Caution: Carrying out the following steps will require special tools and technical knowledge. In order to avoid connection mistakes and / or damage, ask your dealer for assistance if you have any questions and follow all instructions in this manual (see page 23). It is recommended that this unit will be installed by an authorized HELIX dealer.

1. Connecting the pre-amplifier inputs

Use the correct cable (RCA / cinch cable) to connect these inputs to the pre-amplifier / lowlev el / cinch outputs of your head unit / car radio. Each input can be assigned to any output using the DSP PC-Tool software. The automatic turn-on circuit does not work when using the pre-amplifier inputs. In this case the remote input has to be connected to activate the HELIX M SIX DSP.

2. Connecting the highlevel speaker inputs

The highlevel loudspeaker inputs can be connected directly to the loudspeaker outputs of an OEM or aftermarket radio using appropriate cables (loudspeaker cables with 1 mm ^2 / AWG 18 max.).

We recommend the following channel assign-

ment if a common car radio will be connected to the amplifier:

$$ \text { Channel A } = \text { Front left } $$

$$ \text { Channel } B = \text { Front right } $$

$$ \text { Channel C } = \text { Rear left } $$

$$ \text { Channel } D = \text { Rear right } $$

Actually it is not mandatory to use all high level speaker inputs. If only two channels will be connected we recommend to use the channels A and B. Make sure that the polarity is correct. If one or more connections have reversed polarity it may affect the performance of the amplifier. If this input is used the remote input does not need to be connected as the amplifier will automatically turn on once a loudspeaker signal is received.

3. Connecting a digital signal source

If you have a signal source with an optical digital output you can connect it to the amplifier using the appropriate input. In standard configuration the manual activation via an optional remote control is configured.

Alternatively you can activate the automatic turn-on feature in the DCM menu of the DSP PC-Tool software. The feature activates the digital input as soon as a digital audio signal is detected. The automatic turn-on circuit does not work when a digital input is used. Therefore it is

mandatory to connect the remote input (REM).

Important: The signal of a digital audio source normally does not contain any information about the volume level. Keep in mind that this will lead to full level on the outputs of the HELIX M SIX DSP and your connected amplifiers. This may cause severe damage to your speakers. We strongly recommend to use an optional remote control for adjusting the volume level of the digital signal input!

Information: The HELIX M SIX DSP can only handle uncompressed digital stereo signals in PCM format with a sample rate between 12 kHz and 96 kHz and no Dolby-coded digital audio stream!

4. Connection to power supply

Make sure to disconnect the battery before installing the HELIX M SIX DSP!

Connect the +12 V power cable to the positive terminal of the battery. The positive wire from the battery to the amplifier power terminals needs to have an inline fuse at a distance of less than 12 inches (30 cm) from the battery. The value of the fuse is calculated from the maximum total current draw of the whole car audio system (M SIX DSP = max. 80 A RMS at 12 V power supply). If your power wires are short (less than 1 m / 40") then a wire gauge of 10 mm² / AWG 8 will be sufficient. In all other cases we strongly recommend gauges of 16 - 25 mm² / AWG 6 - 4!

The ground cable (same gauge as the +12 V wire) should be connected to a common ground reference point (this is located where the negative terminal of the battery is grounded to the metal body of the vehicle), or to a prepared metal location on the vehicle chassis, i.e. an area which has been cleaned of all paint residues.

5. Connecting the remote input

The remote input (REM) has to be connected to the radio remote output if the amplifiers lowlevel Line Inputs or the Optical Input is solely / are used as signal input/s. We do not recommend controlling the remote input via the ignition switch to avoid pop noise during turn on / off. If the Highlevel Input is used this input does not

need to be connected as long as the car radio has BTL output stages.

6. Configuration of the remote input

The M SIX DSP will be turned on automatically if the Highlevel Input is used or if a signal is applied to the remote input terminal (REM). The Auto Remote switch (page 27, item 12) allows to deactivate the automatic turn-on feature of the highlevel inputs.

The feature should be deactivated (Auto Remote = Off) if there are e.g. noises while switching on / off the amplifier.

Note: If the automatic turn-on function is deactivated it is mandatory to use the remote input terminal to power up the amplifier! The high-level signal will be ignored in this case.

Note: The automatic turn-on feature of the highlevel inputs is activated ex works.

7. Configuration of the internal DSP

The general DSP settings should be conducted with the DSP PC-Tool software before using the amplifier for the first time.

Ignoring this advice may result in damaging the connected amplifiers / loudspeakers. Information about connecting the M SIX DSP to a computer can be found on page 33.

8. Adjustment of the input sensitivity

Attention: It is mandatory to properly adapt the input sensitivity of the M SIX DSP to the signal source in order to avoid damage to the amplifier.

If you want to change the input sensitivity use the "Input Gain" menu of the DSP PC-Tool software.

The factory setting of the input sensitivity is 20 Volts for the Highlevel and 4 Volts for the lowlevel Line Inputs. Only if the head unit / car radio doesn't deliver enough output level, the input sensitivity should be increased carefully.

The “Input Gain” function can be found in the “Signal Management” tab of the DCM menu of the DSP PC-Tool software: “Main Input → Input Gain”.

Installation

Various adjustment examples of the input sensitivity can be found in the table below. For further applications or if you are not sure regarding the signal sources output voltage, please contact your HELIX specialist dealer.

9. Connecting the loudspeaker outputs

The loudspeaker outputs can be connected directly to the wires of the loudspeakers. Never connect any of the loudspeaker cables with the chassis ground as this will damage your amplifier and your speakers.

Ensure that the loudspeakers are correctly connected (in phase), i.e. plus to plus and minus to minus. Exchanging plus and minus causes a total loss of bass reproduction. The plus pole is indicated on most speakers. The impedance of each channel must not be less than 2 Ohms (4 Ohms in bridged mode), otherwise the amplifier protection will be activated.

10. Connecting the remote output

This output (Rem. Out) is used to supply remote signals to the external amplifier/s. Always use this remote output signal to turn on the amplifiers in order to avoid on / off switching noises.

Examples for adjusting the input sensitivity:

Source	Setting Input Gain
4- to 6-channel OEM-RadioUp to 25 Watts RMS power per channel at 4 Ohms or up to 50 Watts RMS power at 2 Ohms	Highlevel: 11 Volts
OEM-Radio with additional 4- to 6-channel amplifier>25 Watts and up to 200 Watts RMS power at 4 Ohms or up to 100 Watts RMS power per channel at 8 Ohms	Highlevel: 20 Volts
4- to 6-channel aftermarket radio with pre- amplifier outputs	RCA / Cinch: typically 4 Volts; see technical data aftermarket radio

Configuration examples

Channel routing with Virtual Channel Processing

From OE system Inputs Outputs To Mechanical channels

graph LR
    A["Front L Full"] --> B["Input A"]
    C["Front R Full"] --> D["Input B"]
    E["Rear L Full"] --> F["Input C"]
    G["Rear R Full"] --> H["Input D"]
    B --> I["Sum signal A to D"]
    D --> I
    F --> I
    H --> I
    I --> J["Front L Full (A) SFX - Front Processing"]
    I --> K["Front R Full (B) SFX - Front Processing"]
    I --> L["Rear L Full (C)"]
    I --> M["Rear R Full (D)"]
    I --> N["Subwoofer 1 (I) SFX - Augmented Bass Processing"]
    J --> O["Amp Out A"]
    J --> P["Amp Out C"]
    J --> Q["Amp Out E"]
    K --> R["Amp Out B"]
    K --> S["Amp Out D"]
    K --> T["Amp Out F"]
    L --> U["Line Out G"]
    L --> V["Line Out H"]
    M --> W["Line Out I"]
    M --> X["Line Out J"]
    O --> Y["Front L High - tweeter FL"]
    P --> Z["Front L Mid - midrange FL"]
    Q --> AA["Front L Low - mid-woofer FL"]
    R --> AB["Front R High - tweeter FR"]
    S --> AC["Front R Mid - midrange FR"]
    T --> AD["Front R Low - mid-woofer FR"]
    U --> AE["Rear L Full - fullrange RL"]
    V --> AF["Rear R Full - fullrange RR"]
    W --> AG["Subwoofer 1 - subwoofer"]
    X --> AH["Subwoofer 2 - subwoofer"]

Configuration layout with additional M SIX – active 3-way front system, passive rear system and two subwoofers in bridged mode

graph TD
    A["Front L Full"] --> B["HELIX"]
    C["Front R Full"] --> B
    D["Rear L Full"] --> B
    E["Rear R Full"] --> B
    B --> F["Speaker Output"]
    F --> G["Line Output"]
    G --> H["HELIX"]
    H --> I["Subwoofer 1 (C/D bridged)"]
    H --> J["Subwoofer 2 (E/F bridged)"]
    K["Tweeter, midrange & mid-woofer"] --> F
    L["Rear Coaxial or passive system"] --> H
    M["For further applications please contact your HELIX specialist dealer."] --> H

Configuration examples

Configuration layout with additional M FOUR – active 3-way front system, passive rear system and subwoofer

graph TD
    A["Front L Full"] --> B["HELIX"]
    C["Front R Full"] --> B
    D["Rear L Full"] --> B
    E["Rear R Full"] --> B
    B --> F["Speaker Output"]
    F --> G["Line Output"]
    G --> H["HELIX"]
    H --> I["M FourA"]
    I --> J["Subwoofer (C/D bridged)"]
    K["Tweeter, midrange & mid-woofer"] --> F
    K --> G
    L["Rear Coaxial or passive system"] --> I

Configuration layout with additional M ONE – active 2-way front system, passive rear system and subwoofer

graph LR
    A["HELIX"] -->|Speaker Output| B["M SIX OSP"]
    B -->|Line Output| C["HELIX M ONE"]
    D["Tweeter & mid-woofer"] --> E["Rear Coaxial or passive system"]
    F["Front L Full"] --> A
    G["Front R Full"] --> A
    H["Rear L Full"] --> A
    I["Rear R Full"] --> A
    J["Subwoofer"] --> C

For further applications please contact your HELIX specialist dealer.

It is possible to freely configure the HELIX M SIX DSP with our DSP PC-Tool software.

The user interface is designed for easy handling of all functions and allows an individual adjustment of each of the ten DSP channels. Prior to connecting the amplifier to your PC visit our website and download the latest version of the DSP PC-Tool software.

Check from time to time for software updates. You will find the software and a huge knowledge base at www.audiotec-fischer.com.

We strongly recommend to carefully read the DSP PC-Tool knowledge base before using the software for the first time in order to avoid any complications and failures.

Important: Make sure that the amplifier is not connected to your computer before the software and USB driver are installed!

In the following the most important steps how to connect and the first start-up are described:

1. Download the latest version of the DSP PC-Tool software (available on our website www.audiotec-fischer.com) and install it on your computer.

2. Connect the amplifier to your computer using the USB cable that is included in delivery. If you have to bridge longer distances please use an active USB extension cable with integrated repeater or the optionally available WIFICONTROLinterface.

3. First turn on the amplifier and then start the software. The operating software will be updated automatically to the latest version if it is not up-to-date.
4. Now you are able to configure your HELIX M SIX DSP with our intuitive DSP PC-Tool software.

Nevertheless, interesting and useful hints can be found in our knowledge base at www.audiotec-fischer.com.

Caution: We highly recommend to set the volume of your car radio to minimum position during first start-up. Additionally no devices should be connected to the amplifier until general settings in the DSP PC-Tool software have been made. Especially if the M SIX DSP will be used in fully active applications, a wrong setup can destroy your speakers right away.

graph LR
    subgraph Inputs
        A["Input EQ"] --> B["Input Processing"]
        C["ISA"] --> D["Input to Virtual routing"]
    end

    subgraph Virtual Processing
        E["Virtual processing EQ"] --> F["SFX"]
        G["Virtual processing Time Gain"] --> E
    end

    subgraph Outputs
        H["Output processing EQ X/Over"] --> I["Output limiter"]
        J["Output processing Time Gain"] --> I
    end

    style Inputs fill:#f9f,stroke:#333
    style Outputs fill:#bbf,stroke:#333

Operating concept of the VCP

In opposite to previous methods the Virtual Channel Processing (VCP) is a multi-stage signal processing concept that enables the perfect configuration of complex sound systems, opening up completely new possibilities for sound tuning.

The function extends the previous scope of the device by an additional layer of processed channels, which is located between the inputs and outputs. A total of eight additional processed virtual channels and ten processed output channels are available.

This virtual channel layer offers several advantages, especially in complex system configurations.

The main advantages of this concept are:

• Cross-channel group equalizers that affect several output channels simultaneously
• Multi-way speaker configuration of DSP sound effects (SFX)
• Additional features such as Rear Attenuation

- Cross-channel group equalizer

Example application: Active multi-way speaker configuration

If an input signal (e.g. front left) is first routed to a virtual channel (Front L Full) and this signal is then routed to an active multi-way system (e.g. front left – tweeter, midrange and woofer), the group equalizer of the virtual channel will influence all assigned output channels in their tonality. The advantage of this concept is that any amplitude and phase shift of the group equalizer is applied to all channels of the multi-way configuration simultaneously, thus avoiding any negative impact on the interaction of the individual speaker channels.

graph TD
    A["Input A\nFront L Full"] --> B["Virtual A\nFront L Full"]
    B --> C["StageXPander\nLight"]
    B --> D["ClarityXPander\nLight"]
    B --> E["StageEQ\ndeactivated"]
    B --> F["AMP Out A\nFront L High"]
    B --> G["AMP Out C\nFront L Low"]

– Multi-way configuration of the DSP sound effects (SFX)

Example application: 2- or even 3-way center speaker

After activating “Virtual Channel Processing”, the DSP sound effects, such as RealCenter management or Augmented Bass Processing, are also available. These are no longer linked to the outputs but tied to specific “virtual channels”.

Front Processing: virtual channels Front L Full (A) and Front R Full (B)

Center Processing: virtual channel Center Full (E)

Augmented Bass Processing: virtual channels Subwoofer 1 (I) and Subwoofer 2 (J). The subwoofer volume is also tied to these channels.

This makes it possible to route the DSP sound effects to any number of outputs, for example to realize 2- or even 3-way center speaker configurations. There are hardly any limits to flexibility here.

- Additional features

In addition, the VCP enables the implementation of further new functions. One of these is, for example, the “Rear Attenuation”. With the help of a remote control, the volume of the virtual channels “Rear L Full” and “Rear R Full” can be controlled separately. So it is possible even without switching the sound setup, to adjust the volume of the rear speakers (or any other channel, which is routed through these channels).

Configuration of the Virtual Channel Processing (VCP)

To configure the VCP, you first have to enable "Virtual Channel Processing" in the DCM menu of the DSP PC-Tool software. Therefore, go to the "Virtual Channel Processing" tab in the DCM menu and click on the right box with the VCP graphic. Then the configuration will be carried out in two steps. Here's an example of a 3-way configuration with a 2-way input signal.

Workflow step 1 – Input routing

First, the input signals in the various input matrices ("Main to Virtual Routing", "HEC / AUX to Virtual Routing", "Digital to Virtual Routing") need to be routed to the respective virtual channels. This is the same as in normal mode, means that the input signals on the left side are dragged and dropped onto the respective summation matrix. The difference to normal mode is that the names and signal properties of the virtual channels are defined here (Front L Full, Front R Full, Rear L Full, Rear R Full, Front Center Full etc.).

a. First, all input signals must be applied to the respective designated signal types of the virtual channels, means the input with the signal "front left" must be routed to the virtual channel "Front L Full" and so forth.
b. In the case of an adaptation of an OEM active multi-way system, all "front left" signals in this example have to be summed up on the virtual channel "Front L Full" (the input EQ remains effective in the inputs as usual).

Workflow step 2 – Output routing

After all the input signals used in the respective signal routing matrix have been configured, the virtual channels must now be assigned to the physical output channels. Here, a virtual signal (e.g. Front L Full) can be assigned to multiple outputs, such as "front left" tweeter, midrange and woofer. The configuration of these speaker-specific output channels is done in the "Outputs" menu (called "Main" in normal mode) of the DSP PC-Tool. Here you can also configure the channel-specific equalizers, high- and lowpass filters, time alignment, output level and phase settings.

a. In order to assign the virtual channels to the respective output channels the individual virtual signals in the output routing matrix ("Virtual to Output Routing") are dragged and dropped onto the output channels. At this point, the signals typically needn't to be summed, means that each output of this matrix only receives one virtual signal. For example, the output "Front L High" is linked to the virtual signal "Front L Full"; the same is done for the Front L Low".

b. At this point, even a virtual channel in which a DSP sound effect has been activated can be routed to multiple output channels. For example, the "Front Center Full" signal can be assigned to multiple output channels to create an active multi-way center speaker. The corresponding high- and lowpass filters are then configured in the output channels of the "Main" menu.

Configuration of the Virtual Channel Processing (VCP)

Workflow step 3 – Configuration of the virtual channels and notes on the application of the DSP sound effects (SFX)

Now switch to the “Virtual” menu of the DSP PC-Tool. Here you get an overview of the signal flow of the individual channels and the activated sound effects. In addition, it is possible to influence the tonality of all subsequent output channels of a virtual channel at the same time, for example with the help of the equalizer, polarity and other functions.

Notes on the configuration of the DSP sound effects (SFX)

The HELIX M SIX DSP provides unique DSP sound effects such as Augmented Bass Processing, RealCenter, and more when “Virtual Channel Processing” is enabled. In order to enjoy the DSP sound effects, certain settings must be made in the hardware and software configuration.

Note: The DSP sound effects are only available in the M SIX DSP when "Virtual Channel Processing" is enabled. "VCP" can be activated in the DCM menu of the DSP PC-Tool software.

Notes for center processing with its features "RealCenter" and "ClarityXpander"

To be able to use the RealCenter and ClarityXpander function for a center speaker, the following steps must be carried out:

1a. It is necessary to assign an input signal to the virtual channels "Front L Full" and "Front R Full" (see workflow step 1).
1b. In the input routing you have to assign either a sum signal (front left + front right) or an existing center signal to the virtual channel "Front Center Full".

1. Change to the "Virtual to Output Routing" matrix and route the "Virtual E – Front Center Full" channel to the desired output channels (as described in workflow step 2) to which the center processing shall be applied.

For information about input routing see workflow step 1

1. Now switch to the FX menu and activate the desired sound effect in the "Center Processing" tab by setting the appropriate check mark.

For information about output routing see workflow step 2

Notes for front processing with its StageXpander and ClarityXpander features

The StageXpander and Front ClarityXpander settings always affect the virtual channels "Front L Full" and "Front R Full".

Hints for "Augmented Bass Processing" with its "Dynamic Bass Enhancement" and "SubXpander" function

For Augmented Bass Processing certain settings have to be made in order to use it.

1. An input signal has to be assigned to at least one of the virtual subwoofer channels ("Subwoofer 1" or "Subwoofer 2") (see workflow step 1).
2. Change to the "Virtual to Output Routing" matrix and route the channel (s) "Virtual I – Subwoofer 1" and / or "Virtual J – Subwoofer 2" to the desired output channel or channels (as described in workflow step 2) to which the subwoofer signal and its Augmented Bass Processing shall be applied to.
3. Now switch to the FX menu and activate the desired sound effect.

Note: the bass processing is switched on and off together for both "Subwoofer 1" and "Subwoofer 2" channels, nevertheless the two channels still remain separately processed for stereo applications.

Configuration of a subwoofer remote control

First, the appropriate remote control must be activated in the "Extended Features" tab in the DCM menu of the DSP PC-Tool software and configured, depending on the model.

If the VCP is not activated, the subwoofer remote control of the M SIX DSP is permanently assigned to the output channels I and J of the Line Outputs. In this case it does not matter which output is named "Subwoofer" in the IO routing matrix.

In the main menu you can also see to which outputs the SubRC (subwoofer remote control) is tied:

When VCP is activated, the subwoofer remote control is tied to the output channels that are supplied with one of the two virtual subwoofer signals ("Subwoofer 1" or "Subwoofer 2") in the "Virtual to Output Routing" matrix. This can be any combination of output channels.

In the following example these are the pre-amplifier outputs / Line Outputs I and J:

Note: Please note that an input signal must be assigned to the two virtual subwoofer signals "Subwoofer 1" and / or "Subwoofer 2" in the other routing matrices.

Afterwards, the subwoofer control is also displayed in the Main menu next to the name of the channel [SubRC]:

Beside the unique DSP sound effects the M SIX DSP provides a bunch of new system features.

In the DCM menu of the DSP PC-Tool software individual settings can be made for several of these system features.

Turn On & Off Delay

This function allows to determine the delay time with which the integrated DSP is switched on and off. The factory setting is 0.2 seconds. The delay time should only be modified if there are e.g. noises while switching on / off the amplifier.

URC Setup Switch Configuration

The ACO provides ten internal memory locations for sound setups instead of the common two.

By using an optional URC remote control or the Control pushbutton it is possible to toggle between two of the ten memory locations. These two memory locations can be determined in the "URC Setup Switch Configuration". The memory locations one and two are preassigned ex works. To switch between all internal memory locations, the optionally available remote controls DIRECTOR and CONDUCTOR or the HELIX WIFI CONTROL are / is recommended.

Remote Output Configuration

This function controls if the remote output (which switches on and off the connected amplifiers) will be temporarily deactivated during a sound setup switch. This function is activated (ON) ex works.

ADEP.3 Configuration

If the M SIX DSP is connected to an OEM radio via the highlevel inputs it may happen that the ADEP.3 circuit has to be adapted to the diagnostic mode of the radio if the latter is equipped with a so-called "class SB" output stage.

The ADEP.3 circuit should be adjusted if there are e.g. distortions in the upper volume range.

The compatibility mode is disabled ex works.

ACO – Advanced 32 Bit CoProcessor

The HELIX M SIX DSP incorporates an extraordinary powerful 32 Bit CoProcessor of the latest generation for all monitoring and communication tasks, both internally and externally. In opposite to the 8 Bit predecessor generation this MCU achieves way higher speeds with respect to setup switching and data communication with our DSP PC-Tool software. A further significant advantage is the integrated, native boot loader of the CoProcessor. It allows software upgrades of all components of the integrated DSP in order to adjust the microcontroller-controlled ADEP.3 circuit for example to future requirements of the diagnostic system of factory radios or if the device will be extended with additional interfaces. In addition, thanks to the new flash memory, the ACO offers 10 memory locations for sound setups instead of the common two.

Smart highlevel input ADEP.3

Modern, factory-installed car radios incorporate sophisticated possibilities of diagnosing the connected speakers. In particular the latest generation of car radios are equipped with additional monitoring functions so that failure messages and loss of specific features (e.g. fader function) quite often appear if an amplifier will be hooked up – but not with the M SIX DSP.

The new ADEP.3 circuit (Advanced Diagnostics Error Protection, 3rd Generation), which can be adapted to the diagnostic mode of the radio, avoids all these problems without loading the speaker outputs of the OE radio during high volumes unnecessarily (see page 41, item "ADEP.3 Configuration").

Start-Stop capability

The switched power supply of the HELIX M SIX DSP assures a constant internal supply voltage even if the battery's voltage drops to 6 Volts during engine crank.

Power Save Mode

The Power Save Mode is incorporated in the basic setup. It allows to significantly reduce the power consumption of the amplifiers that are connected to the HELIX M SIX DSP once there's no input signal present for more than 60 seconds. Please note that in many up-to-date cars with "CAN" or any other internal bus structures it may happen that the radio remains "invisibly" turned on for up to 45 min. even after locking and leaving the car! Once the "Power Save Mode" is active the remote output and therefore the connected amplifiers will be turned off. The M SIX DSP will reactivate the remote output within a second if a music signal is applied. It is possible to either modify the turn-off time of 60 sec. or completely deactivate the "Power Save Mode" via the DSP PC-Tool software.

Technical Data

Power RMS ≤ 1% THD+N

- @ 4 Ohms 6 x 100 Watts

- @ 2 Ohms 6 x 100 Watts

- bridged @ 4 Ohms 3 x 200 Watts

Max. output power per channel*..... Up to 130 Watts RMS @ 4 / 2 Ohms

Amplifier technology .... Class D

Inputs....6 x RCA / Cinch

6 x Highlevel speaker input

1 x Optical SPDIF (12 - 96 kHz)

1 x Remote In

Input sensitivity.... RCA / Cinch: 1 - 4 Volts

Highlevel: 5 - 20 Volts

Input impedance.... RCA/ Cinch: 22 kOhms

Highlevel: 9 - 33 Ohms or 20 kOhms

Outputs....6 x Speaker output

4 x RCA / Cinch

2 x Remote Out

Output voltage RCA / Cinch.... 6 Volts

Frequency response....20 Hz - 22,000 Hz

DSP power 64 Bit / 295 MHz

Sampling rate 48 kHz

DSP type ...... Audio signal processor

Signal converters....A/D: BurrBrown

D/A: BurrBrown

Signal-to-noise ratio (A-weighted)...... Digital input: 105 / 108 dB Speaker / Line Output

Analog input: 102 / 105 dB Speaker / Line Output

Distortion (THD).... < 0.03 / 0.005 % Speaker / Line Output

Damping factor 100

Operating voltage 10.5 - 16 Volts (max. 5 sec. down to 6 Volts)

Power rating ...... DC 12 V=80 A max.

Idle current.... 1950 mA

Max. remote output voltage....500 mA

Fuse.... 2 x 35 A LP-Mini-Fuse (APS)

Additional features.....ADEP.3 circuit, Auto Remote switch,

32 Bit CoProcessor, Control Input

Dimensions (H x W x D) 50 x 320 x 154 mm / 2.00 x 12.60 x 6.06"

* In typical multi-channel applications (2- / 3-way system + rear + subwoofer)

Warranty Disclaimer

The warranty service is based on the statutory regulations. Defects and damage caused by overload or improper handling are excluded from the warranty service. Any return can only take place following prior consultation, in the original packaging together with a detailed description of the error and a valid proof of purchase.

Technical modifications and errors excepted! We accept no liability for damage to the vehicle or device defects caused by the incorrect operation of the device. This product has been issued a CE marking. This means that the device is certified for use in vehicles within the European Union (EU).

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