RHA6 - Audio Amplifier MARANTZ - Free user manual and instructions

Product type	Headphone audio amplifier
Brand	Marantz Professional
Model	RHA6
Number of channels	6 independent channels
Number of headphone outputs	18 (3 per channel: 1 front + 2 rear)
Input connectors	Balanced XLR and 6.35 mm TRS (main input); stereo auxiliary input per channel; front direct input
Output connectors	6.35 mm TRS for headphones; XLR/TRS main outputs for daisy chaining
Power supply	Mains via supplied power cable; calibrated fuse
Recommended headphone impedance	100 ohms minimum for 1 headphone, 200 ohms for 2, 300 ohms for 3 per channel
Format	19-inch rack 1U (rack unit)
Main functions	Input gain, output gain, balance (main/aux mix), L/R mute, mono/stereo selector, LED VU meters
Construction	QS9000 quality certification, high-quality components, gold-plated connectors
Maintenance and cleaning	Disconnect before cleaning; use a dry cloth; do not use abrasive products
Safety	Respect power on/off sequence; do not expose to excessive sound levels; replace fuse with identical type
Spare parts and repairability	Standard fuse; for other repairs, contact Marantz Professional after-sales service
General information	Use in studio, rehearsal, stage; provides six independent mixes

Frequently Asked Questions - RHA6 MARANTZ

How many headphones can I connect to the RHA6?

You can connect up to 18 headphones, i.e. 3 per channel (1 on the front output and 2 on the rear outputs). The recommended minimum impedance is 100 ohms for one headphone, 200 ohms for two, and 300 ohms for three per channel.

How do I adjust the input level to avoid distortion?

Use the input gain and monitor the input level VU meter. The LED should be between 0 and +6 dBu. If the clipping LED on the output VU meter lights up, reduce the input gain or the channel's output gain.

Can I use an external source in addition to the main input?

Yes, each channel has a stereo auxiliary input and a direct input on the front panel. The balance allows mixing the main, direct and auxiliary signals.

How do I set a channel to mono?

Press the mode selector to switch to mono. The mono LED lights up. Then you can use the left/right mute buttons to select which signal is sent in mono.

What power-on sequence should I follow?

First power on the audio sources (instruments, players), then the RHA6, and finally the speakers/amplifiers. To power off, reverse the order.

How do I connect multiple headphone amplifiers together?

Use the main output connectors (XLR and TRS) of the RHA6 to daisy chain multiple units. The main output signal is identical to the main input signal.

What should I do if I have no sound in a headphone?

Check that the output gain is not at zero, that the balance knob is not fully to the left (if the auxiliary input is not used), and that the mono mute buttons are not activated.

Can I connect a microphone directly to the RHA6?

No, the RHA6 is a headphone amplifier, it does not have a microphone input. Connect your microphone to a mixing console, then connect the console output to the RHA6 main input.

What types of cables should I use for audio connections?

Use balanced or unbalanced XLR or 6.35 mm TRS cables. The RHA6 connectors are gold-plated and accept both configurations.

How do I clean the device?

Always disconnect the device before cleaning. Use a dry, soft cloth. Do not use abrasive products or solvents.

USER MANUAL RHA6 MARANTZ

User Guide (English)

Introduction

Thanks for purchasing the Marantz Professional RHA6! RHA6 is a universal, multi-purpose mixer and headphone amplifier for rehearsal, studio, or stage. Perfect for headphones, in-ear monitors, or personal monitor mixing, RHA6 features six independent high-power stereo amplifiers in one compact rack unit that delivers maximum audio quality, even at very high or very low volume levels; RHA6 has a minimized circuitry path which means there's less "stuff" for your signal to pass through, keeping your sound clear and crisp.

• Manufactured under QS9000 certified quality system
- Six independent high-powered headphone amplifiers in a compact, 1RU size
• Supplies six fully independent mixes for up to 18 pairs of headphones
- Stereo Aux Input on each channel with level adjustments
• Additional Direct Input on front panel to mix in additional sources
• Four-segment LED on each channel for easy visual monitoring
• Mono and Left/Right Mutes per channel for two mono mixes per channel
• High-quality components and exceptionally rugged construction
- Servo-balanced, gold-plated XLR and 1/4" TRS connectors

Box Contents

RHA6

Power Cable

User Guide

Safety & Warranty Manual

Support

For the latest information about this product (system requirements, compatibility information, etc.) and product registration, visit marantzpro.com.

Sound Level

Permanent hearing loss may be caused by exposure to extremely high noise levels. The U.S. Occupational Safety and Health Administration (OSHA) has specified permissible exposures to certain noise levels. According to OSHA, exposure to high sound pressure (SPL) in excess of these limits may result in hearing loss. When using equipment capable of generating high SPL, use hearing protection while such equipment is under operation.

Hours per day	SPL (dB)	Example
8	90	Small	gig
6	92	Train
4	95	Subway	train
levels	97	High-level	desl
2 100 Classical music concert
1.5	102	Riveting	machine fact
1	105	Machine
0.5	110	Airport
0.25 or less 115 Rock concert

Features

Front Panel

1. Direct Input: Feeds an external audio source directly into the main signal path.
2. Input Gain Control: Controls the signal level going to the Main Inputs.
3. Input Level Meter: Displays the signal level coming from Main Inputs. For the best quality of input signal, the LED should range from 0 to +6 dBu. If the Clip LED (in the Output Level Meter) is always on, reduce the input level using the Input Gain Control.

4. Aux Input: Provides a separate stereo input signal which can be mixed with the Main Input signal.

5. L Mute Switch: Mutes the left input signal.

6. R Mute Switch: Mutes the right input signal.

7. Mode Switch: Switches the operational mode between mono and stereo.

8. Mono LED: This LED lights up when the unit is in mono mode. When the LED is off, the unit is in stereo mode.

9. Headphone Output: 1/4" TRS phone jack used to output the signal of the individual channel. There are also 12 additional headphone outputs (two for each channel) on the rear panel.

10. Balance Control: Sets the amount of the signal coming from the Aux Input and Main Input. When a signal is fed into the Aux Input, the balance control will regulate the ratio of the Main Input and the Aux Input signals.

11. Output Gain Control: Adjusts the output level of the individual channel.

12. Output Level Meter: Displays the output signal level. If the Clip LED lights up, turn down the input gain control and/or the individual output gain control to avoid distortion.

Rear Panel

1. Power Connector: Use the included power cable to connect this connector to a power source. Please check the voltage accepted by the unit and the voltage available from your power source before connecting it.
2. Fuse Holder: If the fuse blows, replace it with a fuse of the same type.
3. Main Input Connectors: Balanced 1/4" TRS and XLR connectors used to input the stereo signal.
4. Main Output Connectors: Balanced 1/4" TRS and XLR connectors used to output the main signal. Use these connectors to link several headphone amplifiers together.
5. Headphone Out (1-12): These are 12 additional headphone outputs (two for every channel) wired in parallel with the output available on the front panel.

Setup

1. Switch everything on in the following order:

• audio input sources (i.e. instruments, CD/MP3 players)
• RHA6
- speakers/amps

1. When turning off, always reverse this operation:

2. speakers/amps
   • RHA6

3. last, any input sources

Using the Main Input Connectors

1. Connect your source to the rear panel main input connectors on RHA6.
2. Set the input gain (Main section) and the balance control (Channel section) on center position. Set the output gain of each channel all the way down.
3. Check the input level meter for optimal signal.
4. Connect headphones to RHA6 and start to raise the output gain of each channel to the desired listening volume.

Using the Aux Inputs

You can also play back a signal to feed in a vocal microphone and then connect a mixer's Aux send to RHA6's Aux input. Use the balance control to give the vocalist the desired mix between the voice and the playback signal. Then, adjust the output gain control to regulate the overall desired volume.

Through the Aux inputs, you can use the six channels of RHA6 independently to give individual mixes to six different musicians. Connect the Aux Sends or Subgroup outputs directly to the Aux input of RHA6. Then rotate the balance control on your RHA6 fully to the left. This will route only the Aux In signal to the headphones.

graph TD
    A["Input: mapez RF/DC"] --> B["Aux Send 1"]
    A --> C["Aux Send 2"]
    A --> D["Aux Send 3"]
    A --> E["Aux Send 4"]
    A --> F["Aux Send 5"]
    A --> G["Aux Send 6"]
    B --> H["Output: 10x10-100 microcontroller with multiple input channels and output ports"]
    C --> H
    D --> H
    E --> H
    F --> H
    G --> H

Using Multiple Headphones on the Same Channel

Each channel provides three headphone outputs. These jacks are all connected in parallel. For best results, please note the impedance information:

• When connecting one headphone to each channel, the minimum impedance of the headphone should be 100 ohms.
• When connecting two headphones to each channel, the minimum impedance of each headphone should be 200 ohms.
• When connecting three headphones to each channel, the minimum impedance of each headphone should be 300 ohms.

Installation and Connection

Read the following section carefully. Not paying attention to the input signal level, to the routing of the signal and to the assignment of the signal will result in unwanted distortion, a corrupted signal or no sound at all.

Power Connection

Use the same fuse as marked on the fuse holder near the power connector. Connect RHA6 to a standard power outlet using the enclosed power cable.

Audio Connection

The RHA6 uses balanced XLR and 1/4" (6.35 mm) TRS phones jack. It can be connected to other units in a variety of ways to support a vast range of applications without experiencing a signal loss.

Wiring Configuration

You can wire your XLR or 1/4" (6.35 mm) TRS cables as balanced or unbalanced. Here are some examples:

Determine the wiring configuration you need for your application and audio connections:

Balanced

Pure electrical connector diagram showing three types of connectors (no text or symbols)

graph TD
    A["Tip"] --> B["Tip"]
    C["Ring"] --> D["Ring"]
    E["Sleeve"] --> F["Sleeve"]
    G["1"] --> H["1"]
    I["2"] --> J["2"]
    K["3"] --> L["3"]
    M["Tip"] --> N["Tip"]
    O["Ring"] --> P["Ring"]
    Q["Sleeve"] --> R["3"]

Unbalanced

graph TD
    A["Tip"] --> B["Ring"]
    B --> C["Sleeve"]
    C --> D["1"]
    D --> E["Center"]
    D --> F["Screen"]
    G["Tip"] --> H["Sleeve"]
    H --> I["1"]
    I --> J["Center"]
    I --> K["Screen"]
    L["Tip"] --> M["Sleeve"]
    M --> N["2"]
    N --> O["Center"]
    N --> P["Screen"]
    Q["Tip"] --> R["Sleeve"]
    R --> S["3"]
    S --> T["2"]
    T --> U["Screen"]
    V["Tip"] --> W["Sleeve"]
    W --> X["4"]
    X --> Y["3"]
    Z["Tip"] --> AA["Sleeve"]
    AA --> AB["5"]
    AB --> AC["2"]
    AC --> AD["Screen"]

Aplicaciones

Three schematic diagrams of electronic components connected by wires, showing pin layouts and terminal connections (no text or labels)

graph TD
    A["Punta"] --> B["Punta"]
    C["Nuca"] --> D["Nuca"]
    E["Manguito"] --> F["Manguito"]
    G["1"] --> H["1"]
    I["2"] --> J["2"]
    K["3"] --> L["3"]
    M["Punta"] --> N["1"]
    O["Nuca"] --> P["2"]
    Q["Manguito"] --> R["3"]

No balanceado

graph TD
    A["Punta"] --> B["1"]
    C["Nuca"] --> D["2"]
    E["Manguito"] --> F["3"]
    G["Punta"] --> H["1"]
    I["Manguito"] --> J["2"]
    K["1"] --> L["Centro"]
    M["2"] --> N["Anillo"]
    O["3"] --> P["Punta"]
    Q["Punta"] --> R["Manguito"]
    S["Punta"] --> T["Punta"]
    U["Nuca"] --> V["Nuca"]
    W["Manguito"] --> X["Manguito"]
    Y["Punta"] --> Z["Centro"]
    AA["Manguito"] --> AB["Anillo"]
    AC["Punta"] --> AD["Centro"]
    AE["Nuca"] --> AF["Anillo"]
    AG["Manguito"] --> AH["1"]
    AI["1"] --> AJ["Centro"]
    AK["2"] --> AL["Anillo"]
    AM["3"] --> AN["Centro"]

Installation et raccordement

Pure electrical connector diagram showing three types of connectors (no text or symbols)

graph TD
    A["Pointe"] --> B["Pointe"]
    C["Bague"] --> D["Bague"]
    E["Corps"] --> F["Corps"]
    G["1"] --> H["1"]
    I["2"] --> J["2"]
    K["3"] --> L["3"]
    M["Pointe"] --> N["Pointe"]
    O["Bague"] --> P["Bague"]
    Q["Corps"] --> R["Corps"]
    S["1"] --> T["1"]
    U["2"] --> V["2"]
    W["3"] --> X["3"]

Asymétrique

graph TD
    A["Pointe"] --> B["1"]
    A --> C["2"]
    A --> D["3"]
    E["Bague"] --> F["2"]
    E --> G["3"]
    H["Corps"] --> I["3"]
    J["Pointe"] --> K["1"]
    J --> L["2"]
    J --> M["3"]
    N["Corps"] --> O["3"]
    P["1"] --> Q["Centre"]
    R["2"] --> S["Anneau"]
    T["3"] --> U["Centre"]
    V["Pointe"] --> W["Pointe Corps"]
    X["Corps"] --> Y["Corps"]
    Z["Pointe"] --> AA["Pointe Bague Corps"]
    AB["Corps"] --> AC["Corps"]
    AD["Pointe"] --> AE["Centre Anneau"]
    AF["Corps"] --> AG["Centre Anneau"]
    AH["Pointe"] --> AI["Centre Anneau"]
    AJ["Corps"] --> AK["Centre Anneau"]

Three schematic diagrams of electrical connectors with no text or symbols

graph TD
    A["Punta"] --> B["Anello"]
    A --> C["Manica"]
    D["Punta"] --> E["Anello"]
    D --> F["Manica"]
    G["1"] --> H["2"]
    G --> I["3"]
    J["1"] --> K["2"]
    J --> L["3"]
    M["Punta"] --> N["Anello"]
    M --> O["Manica"]
    P["1"] --> Q["2"]
    P --> R["3"]

Non bilanciato

graph TD
    A1["Punta"] --> B1["1"]
    A2["Anello"] --> B2["2"]
    A3["Manica"] --> B3["3"]
    B1 --> C1["Punta"]
    B2 --> C2["Anello"]
    B3 --> C3["Manica"]
    C1 --> D1["1"]
    C2 --> D2["2"]
    C3 --> D3["3"]
    D1 --> E1["Centro"]
    D2 --> E2["Anello"]
    D3 --> E3["Anello"]
    E1 --> F1["Punta"]
    E2 --> F2["Manica"]
    E3 --> F3["Punta"]
    E1 --> G1["Punta"]
    E2 --> G2["Anello"]
    E3 --> G3["Manica"]
    G1 --> H1["Punta"]
    G2 --> H2["Anello"]
    G3 --> H3["Centro"]
    G1 --> I1["Centro"]
    G2 --> I2["Anello"]
    G3 --> I3["Anello"]
    I1 --> J1["1"]
    I2 --> J2["2"]
    I3 --> J3["3"]

Technical Specifications

Inputs
Connectors	XLR and 1/4" (6.35 mm)
Type	Electronically servo-balanced, RF-filtered
Impedance	Balanced: >50 KΩUnbalanced: >25 KΩ
Maximum Input Level	+21 dBU typical, balanced or unbalanced
Aux In and Direct In
Connectors	1/4" (6.35 mm) TRS (tip = left; ring = right; sleeve = ground)
Impedance	Unbalanced: >25 KΩ
Maximum Input Level	+21 dBU, balanced or unbalanced
Output
Connectors	XLR and 1/4" (6.35 mm)
Type	Balanced/Unbalanced
Maximum Output Level	+21 dBu, balanced and unbalanced
Power Amplifier
Maximum Output Power	+21 dBmW
Min. Output Impedance	100 Ω
Maximum Gain	+20 dB
Performance
Frequency Response	10 Hz - 50 kHz, +0/-3 dB
Signal-to-Noise Ratio	>90 dB, unweightedReference: +4 dBu, 22 Hz - 22 kHz
THD	0.005%Reference: +4 dBu
Power	Power Consumption: 14 wattsInput Voltage: 120 V AC, 60 Hz; 230-240 V AC, 50 Hz
Dimensions(width x depth x height)	19.0" x 8.54" x 1.7"483 mm x 217 mm x 44 cm
Weight	6.4 lbs.2.9 kg

Specifications are subject to change without notice.

Trademarks & Licenses

Marantz is a trademark of D&M Holdings Inc., registered in the U.S. and other countries.

All other product or company names are trademarks or registered trademarks of their respective owners.

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