Live 1604 - Mixer ALTO - Free user manual and instructions

Product type	Analog mixing console
Brand	ALTO
Model	Live 1604
Number of channels	16 input channels
Number of buses	4 group buses
Main outputs	2 main outputs (L/R)
Equalization	3-band EQ per channel (HF, MF, LF)
Built-in effects	Digital effects processor with 16 presets
Phantom power	+48V switchable per group
Microphone inputs	10 microphone inputs with preamps
Line inputs	6 line inputs (6.35 mm jack)
Auxiliary outputs	4 monitor returns (AUX)
Connectivity	XLR, 6.35 mm jack, RCA
Dimensions (W x D x H)	approximately 44.5 x 40.6 x 12.7 cm
Weight	approximately 7.5 kg
Power supply	mains 220-240 V, 50/60 Hz
Power consumption	40 W
Maintenance and cleaning	Dust with a soft dry cloth. Avoid solvents.
Safety	Do not expose to moisture. Disconnect before maintenance.
Spare parts and repairability	Contact ALTO customer service for parts and repairs.

Frequently Asked Questions - Live 1604 ALTO

How to connect a microphone to the console?

Use an XLR cable to plug the microphone into a mic input (channels 1 to 10). Activate phantom power (+48V) if the microphone requires it via the dedicated switch.

How to adjust the volume of a channel?

Use the Gain knob for input level, then the Volume (fader) for mix level. Monitor the VU meter to avoid clipping.

How to use the built-in effects?

Press the FX button on the desired channel, then select an effect on the digital processor (reverb, delay, etc.) and adjust the level with the FX Send knob.

What to do if no sound comes out of the speakers?

Check that the cables are properly connected to the Main L/R outputs, that the main faders are open, and that the channels are not muted. Also make sure the speakers are powered on.

How to adjust equalization on a channel?

Use the three knobs HF (highs), MF (mids), and LF (lows). Turn to the right to increase the frequency, to the left to reduce.

Can I plug in a musical instrument directly?

Yes, plug an instrument (guitar, keyboard) into a line input (6.35 mm jack). Use the impedance switch if available or adjust the Gain accordingly.

How to send a signal to a stage monitor?

Use the AUX outputs (1-4). Turn the corresponding AUX knob on the desired channel and connect the monitor to the appropriate AUX output.

Does the console heat up normally?

Slight heat is normal during operation. If it becomes very hot, check that the ventilation slots are not blocked and reduce the volume if necessary.

How to clean the mixing console?

Dust regularly with a soft, dry cloth. For stubborn dirt, use a slightly damp cloth (water only). Never use abrasive products or solvents.

Where to find the serial number of the device?

The serial number is on a label on the back or under the mixing console. It is required for any technical support request.

USER MANUAL Live 1604 ALTO

LIVE 1604

User Guide

English (3 - 9)

Guía del usuario

Español (10 - 16)

Guide d'utilisation

Français (17 - 23)

Guida per l'uso

Italiano (24 - 30)

Benutzerhandbuch

Deutsch (31 - 37)

User Guide (English)

Introduction

Box Contents

Live 1604

Power Cable

User Guide

Safety & Warranty Manual

Support

For the latest information about this product (system requirements, compatibility information, etc.) and product registration, visit altoprofessional.com/live1604.

For additional product support, visit altoprofessional.com/support.

Quick Start / Connection Diagram

Features

Top Panel

Note: The channels have essentially the same controls with some minor variations between Channels 1-6, 7-8, 9-12, and 13-16. The five different channel types are shown here.

1. Mic Input: Connect a microphone or line-level device to these inputs with an XLR cable.
2. Line Input: Connect line-level devices to these inputs with 1/4" cables.
3. Insert: Use a standard 1/4" TRS cable to connect an external processor (such as a compressor, limiter, external EQ unit, etc.) to this jack. The signal will be taken after the channel's gain control and returned before the channel's EQ controls. The tip of the TRS connection is the send, and the ring is the return.
4. Gain: Adjusts the channel audio level (pre-fader and pre-EQ gain). Adjust this so that the Signal LED lights up.
5. Peak LED: The LED will flash if the signal is clipping. If this happens, decrease the setting of the Gain knob.
6. Compressor: Adjusts the amount of compression on the channel, applied by the mixer's built-in compressor. The LED next to the knob will light up when the compressor is on.
7. Low Cut Filter: When this button is depressed, that channel's audio will be sent through a 75 Hz low-frequency filter with a slope of 18 dB per octave. This is useful for reducing low-frequency noise when using microphones.
8. Hi EQ: Adjusts the high (treble) frequencies of the channel.
9. Mid EQ: Adjusts the mid-range frequencies of the channel.
10. Mid Freq: Adjusts the mid-range frequency band (100 Hz – 8 kHz) affected by the Mid EQ knob.
11. Hi-Mid EQ: Adjusts the high-mid-range frequency (3 KHz) of the channel.

1. Low-Mid EQ: Adjusts the low-mid-range frequency (500 Hz) of the channel.
2. Low EQ: Adjusts the low (bass) frequencies of the channel.
3. Aux 1/2 Knobs: Adjusts the level of the signal sent from that channel to the corresponding Aux bus. Use the Aux Post/Pre button to set whether the level is sent pre-fader or post-fader.
4. Aux Post/Pre: When raised, the Aux 1/2 knobs control the post-fader level of the signal sent from that channel to the corresponding Aux bus. When depressed the signal is pre-fader.
5. Aux 3 Knob: Adjusts the post-fader level of the signal sent from that channel to the Aux 3 bus.
6. Aux 4 / DFX Knob: Adjusts the post-fader level of the signal sent to the mixer's effects processor, whose level is controlled by the DFX Return Fader (DFX Rtn). If an external effects processor is connected to Aux Send 4, then the signal will be sent there instead of to the mixer's effects processor.
7. Channel Pan / Balance: If this knob is labeled Pan, it adjusts the (mono) channel's position in the stereo field. If the knob is labeled Bal, it adjusts the balance between the left and right channels of that stereo signal.
8. Channel Mute: Press this button to mute/unmute the channel. The LED next to the button will light up when the channel is muted.
9. Channel Solo: Press this button to solo/unsolo the channel. The LED next to the button and the Solo Active LED will light up when the channel is soloed. Use this to view its level in the LED Meters and to audition its audio alone in the Control Room Mix.
10. Channel Fader: Adjusts the audio level on the channel.
11. Output Buttons: Depress any combination of these buttons to send the channel's post-fader signal to the corresponding outputs: Sub 1-2 (Subgroups 1 and 2), Sub 3-4 (Subgroups 3 and 4), and/or Main L/R (Main Outputs).

12. Signal LED (Sig): Indicates that the channel's incoming audio signal is within an optimal range.

13. Control Room Outputs (Ctrl Out): Use standard 1/4" TRS cables to connect these outputs to your control room (booth) monitors or amplifier system.

14. Subgroups Outputs: Use standard 1/4" TRS cables to connect these outputs to your monitoring amplifier system, and control their levels with the Subgroup Faders. You can use these outputs for group processing or for sending certain channels to a destination other than the Main Mix.
15. 2-Track Inputs (2 Track In): Connect these inputs to the outputs of an external sound source using a standard stereo RCA cable (sold separately). Use the 2 Track In Source button to send this signal either to the Main Mix Outputs or to the Control Room Outputs (Ctrl Out).
16. 2-Track Outputs (2 Track Out): Connect these outputs to the inputs of an external recording device using a standard stereo RCA cable (sold separately).
17. Aux Send: Use 1/4" TRS cables to connect these outputs to the inputs of an external amplifier or active monitor. Use the Aux Send knobs on each channel to control the level of the signal sent to these outputs. This is useful for creating a custom monitor mix for onstage musicians.
18. Aux Sends Knobs: Use these knobs to control the overall level of the signal sent to the Aux Sends. (Use the Aux 1-4 Knobs on each channel to control the signal sent here from each channel.)
19. Aux Sends Solo: Depress these buttons to solo that channel in the Phones Outputs.
20. Aux Return Knob (Aux Rtn): Controls the audio level sent into the Aux Return (Aux Rtn) inputs. The first and second knobs control the Aux Return levels sent to the Main Mix.
21. Aux Returns to Aux Sends: Use these knobs to control the level of the signal sent from the corresponding Aux Return to the Aux Send bus with the same number. This is helpful when using cascading mixers (e.g., sending the submixer's Aux Sends to this mixer's Aux Returns, allowing the submixer's Control Room Mix to be sent to this mixer's subgroups and then into its Control Room Mix).

1. Aux Return 3 Routing: When this button is depressed, the signal sent into Aux Return 3 will be routed to the Control Room Mix. When this button is raised, the signal is sent to the Main Mix.
2. Aux Return 4 Routing: Depress any combination of these buttons to send the signal sent into Aux Return 4 to the corresponding outputs: Sub 1/2 (Subgroups 1 and 2), Sub 3/4 (Subgroups 3 and 4), and/or the Main Mix (Main Outputs).
3. Aux Return Solo: Depress this button to solo Aux Returns 1-4 in the Control Room Mix.
4. Graphic Equalizer: When the EQ On/Off switch is on (depressed), you can use these controls to adjust the equalization of the main mix.
5. EQ On/Off: Enables or disables the Graphic Equalizer.
6. Main Out / Monitor Out: When this button is raised, the Graphic Equalizer will affect the signal sent to the Main Mix Outputs. When this button is depressed, the Graphic Equalizer will affect the signal sent to the Aux 1/2 (Mon) Output.
7. Effect Selector: This knob determines what effect the mixer's internal effects processor will apply to the various channels. Turn the knob to change the effect number, and push the knob to select it. The display next to the DFX Mute button will show the preset number. Each channel can send different levels of audio to the processor by adjusting its DFX Knob. See the Effects section for an explanation of the available effects.
8. DFX Mute: Press this button to mute/unmute the effects.
9. DFX Peak LED: The LED will flash if the signal is clipping. If this happens, decrease the setting of your source channels' DFX Knobs. When the effects processor is muted, the LED will be solidly lit.
10. DFX Out to Aux 1/2: These knobs control the level of the signal sent from the effects processor to Aux Sends 1 and 2.
11. DFX Out to Main: This knob controls the level of the signal sent from the effects processor to the Main Outputs.
12. Phones Output: Connect 1/4" stereo headphones to these outputs. The Phones Volume knob controls the volume.
13. Control Room Source: When any combination of these buttons is depressed, the signals from those sources will be heard in the Control Room Mix: Main Mix, Sub 1/2 (Subgroups 1 and 2), and/or Sub 3/4 (Subgroups 3 and 4).
    Note: If any Solo button is depressed, the soloed audio will replace the signal heard in the Control Room Mix, regardless of the positions of these buttons.
14. Phones Volume: Adjusts the volume of Phones Output.
15. Control Room Volume: Adjusts the volume of Control Room Outputs (Ctrl Out).
16. 2 Track In Source: Depress the 2Tk In button to include the 2 Track In signal with the Control Room Mix. Depress the 2Tk to Main button to include the 2 Track In signal with the Main Mix.
17. 2 Track Level: Adjusts the level of the 2 Track In signal.
18. Subgroup Fader: Adjusts the level of the corresponding Subgroup.
19. Subgroup Assignments: Depress any combination of these buttons to assign their corresponding Subgroups (beneath them) to that channel (Left or Right) of the Main Mix,
20. Main Fader: Adjusts the level of the Main Mix Outputs.

21. LED Meters: Shows the audio level of the Main Mix Outputs or the Control Room Outputs (Ctrl Out), depending on the position of the Control Room Source buttons. The Clip LED can light up occasionally, but if it happens too often, reduce the volume of the mix and/or individual channels.

22. Power LED: Illuminates when the mixer is on.

23. Phantom Power LED: Illuminates when the Phantom Power switch is on.
24. Level Set: Illuminates when the LED Meters are showing the pre-fader audio level of any actively soloed channels rather than those of the Main Mix or Control Room Mix. The Solo Mode button must be in the raised position (PFL) (changes to fader levels will not affect the LED meters and the level heard).
25. Solo Active: Illuminates when the LED Meters are showing the after-level audio level of any actively soloed channels rather than those of the Main Mix or Control Room Mix. The Solo Mode button must be in the depressed position (AFL) (changes to fader levels will affect the LED meters and the level heard).
26. Solo Mode: When raised, the audio from a channel whose Solo button is depressed will be heard pre-fader (PFL). When depressed, the audio will be heard post-fader (after-fader or AFL).
27. USB Power Connection: You can use this USB port to connect and power (or charge) a device that requires power from a 5V USB bus.

Effects

To apply effects, turn the Effects Preset Knob and press it to select one of the available presets. To send a channel's signal to the effects processor, turn up that channel's DFX Knob (Aux 4).

Each effect has 10 variations. Select one that suits the environment and your preferences.

Numbers Effect Description

00-09 Delay Reproduces the signal after a small period of time.
10-19 Delay+Verb Delay effect with room reverb.
20-29 Tremolo Rapidly increases and decreases the signal volume at a regular rate.
30-39 Plate Simulates bright plate reverb.
40-49 Chorus Simulates the full, complex, watery sound of several instruments playing the same thing.
50-59 Vocal Reverb, simulating a room with a small delay time.
60-69 Rotary Simulates the classic Doppler effect of the spinning horn inside an organ speaker.
70-79 Small Room Reverb simulating a bright studio space.
80-89 Flange+Verb Applies room reverb plus a classic stereo flanging effect.
90-99 Large Hall Reverb simulating a large acoustic space.

Rear Panel

1. Power In: Use the included power cable to connect the mixer to a power outlet. While the power is switched off, connect the power cable into the mixer first, then connect the power cable to a power outlet.
2. Fuse Cover: If the fuse is broken, use a screwdriver or other tool to lift this tab, and replace the fuse with a fuse with the same rating (printed just above the Power In). Using a fuse with an incorrect rating can damage the unit and/or fuse.
3. Power Switch: Powers the mixer on and off. Turn on the mixer only after connecting all of your input devices but before turning on your amplifiers. Turn off amplifiers before you turn off the mixer.
4. Phantom Power: Activates/deactivates phantom power. When activated, phantom power supplies +48V to the XLR mic inputs. Please note that most dynamic microphones do not require phantom power, while most condenser microphones do. Consult your microphone's documentation to find out whether it needs phantom power.
5. Main Mix Outputs: Use standard XLR or 1/4" TRS cables to connect either pair of these outputs to your loudspeakers or amplifier system. Use the Main Fader to control the level of these outputs.
6. Main Mix Pad: When this button is depressed, the signal sent to the Main Mix Outputs is reduced by 10 dB. When raised, the signal is increased by 4 dB. Set this switch depending on the nominal operating level of your equipment; professional-grade equipment works at a nominal +4 dBu while consumer-grade equipment works at a nominal -10 dBV.
7. Main Mix Insert: Use a standard 1/4" TRS Y-cable to connect an external processor (such as a compressor, limiter, external EQ unit, etc.) to this jack. The signal will be taken after the Graphic Equalizer and returned before the Main Fader. The tip of the TRS connection is the send, and the ring is the return.

8. USB Port: Use a standard USB cable to connect this USB port to a computer. The mixer can send or receive audio to or from your computer through this connection.

9. When sending audio, the Main Mix or Subgroups 1 and 2 will be sent from the mixer to your computer, depending on the position of the Record switch.

10. When receiving audio, it will be sent from your computer to Channels 15/16 or Main Mix, depending on the position of the Play Back switch.

11. Record: This switch determines what audio is sent to the computer from the mixer's USB Port: Subgroups 1 and 2 (Sub 1/2) or the Main Mix.

12. Play Back: This switch determines where the audio sent from the computer (to the mixer's USB Port) will be routed when it returns to the mixer: Channels 15/16 (Ch 15/16) or the Main Mix.

13. DFX Out: Use a standard 1/4" TRS cable to connect this output to an amplifier system. The signal from the mixer's effects processor will be sent to this output.
14. Bypass: Connect an optional standard 1/4" TS footswitch (sold separately) to this input. You can use the footswitch to activate or deactivate the mixer's effects processor.
15. Stereo Aux Return: Connect the outputs of an external device to these inputs with 1/4" mono cables. If your source is mono, plug it into the left jack and it will be heard on both the left and right sides.

Assistance technique

Technical Specifications

Mono Input Channels	Microphone inputs: Electronically balanced, discrete input configurationFrequency response: 20 Hz to 20 kHz, +0.5 dBTHD+N: <0.005% at 0 dBu, 1 kHzGain range: 0 dB to 50 dB (Mic)SNR: 90 dB
Line Inputs	Electronically balancedFrequency response: 20 Hz to 20 kHz, +0.5 dBTHD+N: <0.03% at 0 dBu, 1 kHzSensitivity range: -15 dBu to 30 dBu
Impedances	Microphone inputs: 51.1 KΩChannel insert return: 200 KΩAll other inputs: >100 KΩMain outputs: 200 Ω2-Track outputs: 10 KΩAll other outputs: 20 KΩ
Equalization	Mono ChannelsHigh-shelving: ±15 dB @ 12 kHzMid-bell (mono): ±15 dB sweep able from 100 Hz – 8 KHzLow-shelving: ±15 dB @ 80 HzStereo ChannelsHigh-shelving: ±15 dB @ 12 kHzHigh-Mid-bell (mono): ±15 dB @ 3 KHzLow-Mid-bell (mono): ±15 dB @ 500 HzLow-shelving: ±15 dB @ 80 HzMain EQ: 9 EQ bands (63 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, 16 kHz), ±15 dB
DSP Section (DFX)	A/D & D/A converters: 24-bitDSP Resolution: 24-bitEffects: 10 DSP effects families with 10 variations available per familyPresets: 100 totalControls: Rotary encoder to select preset, DSP mute switch, peak LED indicator
Main Mix Noise (bus	noise):Fader 0 dB, channels muted: -84 dBr (ref: +4 dBu)Fader 0 dB, all input channels assigned & set to unity gain: -73 dBr (ref: +4 dBu)Phantom Power: Mic Pin2/Pin3 and Pin1 48±2V
Power Supply	Main voltage:USA/Canada: 100-120 VAC ~60 HzUK/Australia: 240 VAC ~50 HzEurope: 210-240 VAC ~50 HzPower consumption: 35 WFuse: 1.25 AMain connection: Standard IEC receptacle
Dimensions(width x depth x height)	19.4" x 16.4" x 3.1"49.3 cm x 41.7 cm x 7.9 cm
Weight	13.1 lbs.5.9 kg

Specifications are subject to change without notice.

Trademarks and Licenses

Alto Professional is a trademark of inMusic Brands, 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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