Alto Professional TrueMix 600 User manual

TrueMix 600
User Guide

2
Table of Contents
(1.0) INTRODUCTION......................................................... 4
(1.1) Box Contents.............................................................................................4
(1.2) Support.......................................................................................................4
(1.3) Important Safety Precautions............................................................4
(1.4) Sound Level..............................................................................................4
(2.0) SETUP ..........................................................................5
(2.1) Connection Diagram.............................................................................. 5
(2.1.1) Top Panel........................................................................................................................... 5
(2.1.2) Rear Panel ........................................................................................................................ 7
(2.2) Common Setup Scenarios.................................................................. 8
(2.2.1) Live Sound ....................................................................................................................... 8
(2.2.2) Podcasting ...................................................................................................................... 9
(3.0) FEATURES.................................................................10
(3.1) Top Panel................................................................................................. 10
(3.2) Rear Panel................................................................................................13
(4.0) OPERATION..............................................................14
(4.1) USB Recording and Playback.......................................................... 14
(4.2) Connecting a Bluetooth Device......................................................15

3
(5.0) TROUBLESHOOTING............................................... 16
(6.0) APPENDIX ................................................................. 18
(6.1) Technical Specifications .....................................................................18
(6.2) Trademarks & Licenses.......................................................................19

4
Thank you for purchasing the TrueMix 600. At Alto Professional, performance and
reliability mean as much to us as they do to you. We design our equipment with only
one thing in mind—to make your performance the best it can be.
Note: For clarity, this User Guide uses section references. In some instances one
section may extend to several pages.
(1.1) Box Contents
TrueMix 600
Power Adapter
USB Cable
Registration Card
Quickstart Guide
Safety & Warranty Manual
(1.2) Support
For the latest information about this product (system requirements, compatibility
information, etc.) and product registration, visit altoprofessional.com.
For additional product support, visit altoprofessional.com/support.
(1.3) Important Safety Precautions
Please note: Alto Professional and inMusic are not responsible for the use of its
products or the misuse of this information for any purpose. Alto Professional and
inMusic are not responsible for the misuse of its products caused by avoiding
compliance with inspection and maintenance procedures. Please also refer to the
included safety and warranty manual for more information.
(1.4) 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 levels (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
3 97 High-level desktop monitors
2 100 Classical music concert
1.5 102 Riveting machine
1 105 Machine factory
0.5 110 Airport
0.25 or less 115 Rock concert
(1.0) INTRODUCTION

5
(2.1) Connection Diagram
Items not listed under (1.1) Introduction >Box Contents are sold separately.
See the connector examples below for using XLR or 1/4” (6.35 mm) wiring as
balanced or unbalanced. This can be of help if you make your own cables.
(2.1.1) Top Panel
Example 1 – Live Sound:
Stage Monitors
House Loudspeakers
Headphones
External Effects Unit
Smartphone
Electric Guitar
Microphone
Ke
y
board
CD Player
Tip
Sleeve
Pin 2
Pin 3
Pin 1,
linked to Pin 3
Tip
Sleeve
Ring
Pin 1
Pin 3
Tip
Sleeve
Ring
Pin 2
(Ground) (Ground) (Ground)
(Ground) (Ground)
TS TRS TRS XLR XLR
(2.0) SETUP

6
Example 2 – Podcast:
Microphones
Head
p
hones
Smartphone
Sampler
Studio
Monitors
(2.0) SETUP

7
(2.1.2) Rear Panel
Power
Computer
(2.0) SETUP

8
(2.2) Common Setup Scenarios
(2.2.1) Live Sound
1. Study the Live Sound (2.1) Connection Diagram section for ideas to plan your
setup.
2. Choose a layout for your gear that compliments the venue’s walkways, power
locations, and acoustics (so you can properly hear your mix).
3. Make sure all devices are turned off.
4. Set all TrueMix 600 Gain knobs to -20 dB, Channel Volume knobs to -∞,Hi and
Low EQ knobs to the 12 o’clock position, and Main Out Volume knob to -∞.
5. Connect all input sources, such as microphones, keyboard, electric guitar, or a CD
player to the appropriate XLR, 1/4" (6.35 mm), or RCA inputs.
6. If using an external effects unit, connect the Aux Send of TrueMix 600 to the
inputs of the effects unit. Connect the outputs of the effects unit to the Aux
Return of TrueMix 600.
7. Connect all output sources. For example, you can connect TrueMix 600's Main
Out to the house loudspeakers using 1/4" (6.35 mm) cables, or connect the Aux
Send to stage monitors using 1/4" (6.35 mm) cables (if you are not already using
these for an external effects unit).
8. Pair your Bluetooth device with TrueMix 600. See the section (4.2) Operation >
Connecting a Bluetooth Device for more details.
9. Connect all devices to power outlets.
10. Switch everything on in the following order:
•Audio input sources
•TrueMix 600
•Last, any speakers or headphones
11. Test the mic at the loudest level it is expected to be used and begin turning up
the Gain knob until you see the channel Peak LED flash red. This means the Gain
knob is set too high. Turn down the Gain knob until you no longer see the LED
flash red. Repeat this process for other channels you are using.
12. If you are using stage monitors, create the monitor mix by adjusting each
channel’s Aux Send level. The more you turn up a channel’s Aux knob, the more
they will hear it in the connected stage monitor.
13. Send TrueMix 600’s channels to the Main Outs (house loudspeakers) by turning
up the Channel Volume knobs.
14. Turn up the Main Out Volume knob until the volume compliments the venue.
You’ll want to get the Main Output Level LED Meter as close to the top LED
without it clipping.
15. When turning off equipment, follow this order:
•Speakers or headphones
•TrueMix 600
•Last, any audio input devices
(2.0) SETUP

9
Tips:
•If the sound is too boomy, decrease the low EQ frequencies.
•For more clarity, boost the high EQ frequencies.
•Never point microphones and speakers at each other.
•Mute unused channels when they’re not in use.
•Use board tape to label channels.
•Always have backup cables.
(2.2.2) Podcasting
1. Study the Podcast (2.1) Connection Diagram section for ideas to plan your
setup.
2. Choose a layout for your gear that compliments your desk and power locations.
3. Make sure all devices are turned off.
4. Set all TrueMix 600 Gain knobs to -20 dB, Channel Volume knobs to -∞,Hi and
Low EQ knobs to 12 o’clock, and Main Out Volume knob to -∞.
5. Connect all input sources, such as microphones, keyboard, or a sampler to the
appropriate XLR or 1/4" (6.35 mm) inputs.
6. Connect a laptop for streaming or recording of a podcast via a USB connection.
See the section (4.1) Operation > USB Recording and Playback for more details.
7. Connect TrueMix 600’s Main Out to your speakers using 1/4" (6.35 mm) cables.
8. Pair your smartphone with TrueMix 600 to stream calls or interviews. See the
section (4.2) Operation > Connecting a Bluetooth Device for more details.
Note: To avoid RF interference from being picked up, place your smartphone
away from speakers.
9. Connect all devices to power outlets.
10. Switch everything on in the following order:
•Audio input sources
•TrueMix 600
•Last, any speakers or headphones
11. Speak into your mic at the loudest level you expect to speak in your stream and
begin turning up the Gain knob until you see the channel Peak LED flash red.
This means the Gain knob is set too high. Turn down the Gain knob until you no
longer see the LED flash red. Repeat this process for other channels you are
using.
12. Send TrueMix 600’s channels to the Main Outs by turning up the Channel
Volume knobs.
13. Turn up the Main Out Volume knob until a desired volume is reached. You’ll want
to get the Main Output Level LED Meter as close to the top LED without it
clipping.
14. When turning off equipment, follow this order:
•Speakers or headphones
•TrueMix 600
•Last, any audio input devices
(2.0) SETUP

10
(3.1) Top Panel
1. Mic Inputs: Connect a microphone to these phantom power-equipped inputs
using an XLR cable (sold separately). See the Phantom Power Switch feature
for more details.
2. Line Inputs: Connect line-level devices to these inputs with 1/4" (6.35 mm)
cables (sold separately).
Note: The line inputs on channels 3 and 4 are stereo inputs.
Connecting a device using a single cable to only the L (Mono) input will send
the signal through both the Left and Right Main Mix Output channels.
Connecting to only the R (Stereo) line input will send the signal through the
Right Mix channel only.
3. Gain: Turn this knob to adjust the channel audio level (pre-fader and pre-EQ
gain). Set the gain to a level at which the Peak LED just barely lights up during
the loudest parts of the song.
4. HI EQ (Treble): Turn this knob to adjust the high (treble) frequencies of the
channel’s output signal.
5. LOW EQ (Bass): Turn this knob to adjust the low (bass) frequencies of the
channel’s output signal.
(3.0) FEATURES

11
6. Aux Send Knob: Turn this knob to adjust the signal
volume sent from the channel input to the Aux Send
Output. This knob also adjusts the signal volume sent
back to the Bluetooth channel during use on a phone
call with a connected device. See the section (4.2)
Operation > Connecting a Bluetooth Device for
more details.
7. Channel Pan: Turn this knob to adjust the (mono)
channel's Left-Right position in the stereo field.
8. Peak LED: This LED will flash when the signal is
clipping. If this happens, decrease the level on the
Gain knob or Channel Volume knob.
9. Channel Volume: Turn this knob to adjust the level of
the channel’s output signal.
10. Control Room Outputs: Use 1/4” (6.35 mm) TRS
cables to connect these outputs to your monitor or
amplifier system. The level of these outputs is
controlled by the Control Room Headphone Output
knob.
11. Aux Return Inputs: Connect the outputs of an external device to these inputs
with standard 1/4” (6.35 mm) cables. Aux Return is commonly used for
outboard effects devices but can also be used like an extra input channel for
synthesizers, drum machines, etc. If your source is mono, plug it into the left
input and it will be heard on both the left and right sides. The level of these
inputs is controlled by the Aux Return volume knob.
12. Aux Send Output: Use a 1/4” (6.35 mm) TRS cable to connect the Aux Send
output to the input of an external amplifier or active monitor to create a custom
monitor mix for onstage musicians. You can adjust the signal volume for each
channel in this mix using the Aux Send knobs.
13. Aux Return Volume: Turn this knob to adjust the level of the signal sent from
the Aux Return Inputs to the Main Output.
14. Main Outputs: Use 1/4" (6.35 mm) TRS cables to connect these outputs to a
speaker or amplifier system. The level of these outputs is controlled by the Main
Out knob.
15. Control Room/Headphone Output (1): Connect a pair of stereo headphones to
this 1/4” (6.35 mm) TRS output to monitor your Main Output or 2TK/USB
signals.
16. Main Out/Headphone Output (2): Connect a pair of stereo headphones to this
1/4” (6.35 mm) TRS output to monitor your Main Output signal.
17. Headphone Source: Press this button to switch the Headphone Output 1
source between the Main Out and 2TK/USB. Headphone Output 2 monitors the
Main Output only and is unaffected by this button.
18. Headphone/Control Room Volume Controls: Turn these knobs to adjust the
volume of the corresponding Headphone outputs directly above. The volume
knob for Headphone Output 1 also controls the Control Room Output volume.
19. 2TK/USB Inputs: You may connect these inputs to the outputs of an external
sound source using a standard stereo RCA cable (sold separately). You can also
send this channel to the headphone mix (using the Headphone Source button)
and/or the main mix (using the 2TK/USB To Main Out button).
(3.0) FEATURES

12
20. 2TK/USB Outputs: You may connect these
outputs to the inputs of an external recording
device using a standard stereo RCA cable (sold
separately).
21. 2TK/USB In Volume: Turn this knob to adjust the
volume of your 2TK/USB Input signal.
22. 2TK/USB To Main Out: Press this button to send
the 2TK/USB Input signal through the Main
Outputs.
23. Power/Phantom LEDs: The Power LED will
illuminate when the mixer is powered on. The
Phantom LED will illuminate when the Phantom
Power Switch is in the ON position.
24. Phantom Power Switch: Set this switch to the ON
position to send 48 Volts of phantom power to
the Mic Inputs.
Note: Most dynamic microphones do not require phantom power, while most
condenser microphones do. Please use caution and consult your microphone’s
documentation to find out if it requires phantom power before connecting your
microphone to the Mic Inputs and attempting to use this function.
Misapplication of this function can damage certain types of microphones, such
as ribbon microphones. Always connect the microphone FIRST, then turn on
phantom power.
25. Output Level LED Meters: These LEDs display the audio level of the Main
Output. Turn the Main Out Volume down if the Clip LED at the top of the meter
lights up excessively.
26. Bluetooth Pairing Button: Press and hold this button to activate Bluetooth
pairing mode to connect a Bluetooth device with TrueMix 600. See the section
(4.2) Operation > Connecting a Bluetooth Device for further instructions.
27. Bluetooth Volume: Turn this knob to adjust the volume of the Bluetooth signal
being sent to the Main Output.
28. Main Out Volume: Turn this knob to adjust the volume of the Main Output.
(3.0) FEATURES

13
(3.2) Rear Panel
1. Power Switch: Flip this switch to power TrueMix 600 on and off.
Note: Always make sure to only turn the mixer on after all input devices have
been connected and before you turn on amplifiers. Always turn off all amplifiers
before you turn the mixer off.
2. Power: Use the included power adapter to connect TrueMix 600 to a power
outlet.
Note: Make sure the Power Switch is in the OFF position before connecting the
mixer to a power outlet.
3. USB Out: Connect a USB Type-B cable here to use the TrueMix 600 with a
computer for recording and playback. See the section (4.1) Operation > USB
Recording and Playback to learn how to do this.
(3.0) FEATURES

14
(4.1) USB Recording and Playback
To set TrueMix 600 as the default playback device on your computer, follow the set
of directions below that corresponds to your computer’s operating system.
Note: If you have other USB audio devices connected to your computer, which may
have identical names, you may need to try selecting each one until the TrueMix 600
is recognized.
Windows 10:
1. Use the included USB cable to connect the TrueMix
600 to your computer. Press the power switch to
power on TrueMix 600.
2. Press the Windows key and then type “Sound Settings”
into the search bar. Alternatively, right-click the
“speaker” icon in the taskbar and select Open Sound
Settings.
3. In the Windows Sound control panel select the Output dropdown box and select
USB Audio Codec.
4. Select the Input dropdown box and select USB
Audio Codec.
5. Close the Sound control panel.
Windows 11:
1. Use the included USB cable to connect the TrueMix
600 to your computer. Press the power switch to
power on TrueMix 600.
2. Press the Windows key and then type “Sound
Settings” into the search bar. Alternatively,
right-click the “speaker” icon in the taskbar and
select Sound Settings.
3. In the Windows Sound control panel select the Output section and select USB
Audio Codec.
4. In the Input section select USB Audio Codec.
5. Close the Sound control panel.
macOS:
1. Use the included USB cable to connect the TrueMix 600 to your computer. Press
the power switch to power on TrueMix 600.
2. Go to Applications > Utilities > Audio MIDI Setup.
3. In the Audio Devices window, select USB Audio Codec in the left column.
4. Right-click USB Audio Codec and select Use this device for sound input.
5. Right-click USB Audio Codec and select Use this device for sound output.
6. Quit Audio MIDI Setup.
(4.0) OPERATION

15
(4.2) Connecting a Bluetooth Device
1. Press and hold the Bluetooth button for 3 seconds, then release it. TrueMix 600
will go into Bluetooth pairing mode and the blue LED will begin flashing
repeatedly. Bluetooth pairing will time out after 2 minutes if no device is
connected.
Note: Pressing the Bluetooth button again during pairing process before a
device is paired will cancel the pairing process.
2. Navigate to your Bluetooth device’s setup screen, find the device named
“TrueMix 600” and connect.
3. When paired successfully, the blue LED will illuminate solid.
Note: If your Bluetooth device prompts that a pairing code is required, use
“0000”.
4. Turn up the volume on your Bluetooth device and then turn up the Bluetooth
volume knob. If signal distortion occurs, turn down the volume on your Bluetooth
device.
To disconnect a paired device, press and hold the Bluetooth button for 3 seconds.
The next time Bluetooth pairing is activated, TrueMix 600 will try to connect with
the last device that was paired with it. If after 2 minutes the last paired device is
unavailable, it will go into standby mode until you initiate a new device pairing.
Notes:
1. The TrueMix 600’s Bluetooth memory can store up to 5 user devices.
2. Pressing and holding the Bluetooth button for 10 seconds while a device is
paired will unpair the device and remove it from memory.
Interfacing with Bluetooth Calls:
TrueMix 600 has a special feature for use with Bluetooth-connected smartphones
called Mix-Minus Return. This feature allows you to send signal from the Mic/Line
inputs to a connected smartphone without generating feedback or echo from
incoming call audio. This is useful for cleanly recording a remote phone call for a
podcast or radio show.
To send a Mic or Line signal to a Bluetooth-connected smartphone, turn up the
Aux Send knob on the channel you want to send to set the desired signal level to be
received by the phone.
(4.0) OPERATION

16
If the mixer is not being detected by your computer:
•Connect to a different USB port.
•Avoid using passive (unpowered) USB hubs.
•Try using a different USB cable.
•Disconnect other USB devices.
•Disable Windows sleep and screensaver when recording/streaming.
If no sound is heard from your speakers:
•Make sure the input Gain knobs,Channel Volume knobs,and Main Out Volume
knobs are turned up.
•Make sure microphones, external devices, and speakers are properly connected
with working, secure cables.
If the sound is distorted:
•Try lowering the volume control of your sound source, musical instrument, or
microphone.
•Try adjusting the channel EQ if there is too much treble or bass.
•Turn the input Gain knobs to the left to lower the signal.
•Adjust the overall volume of the mixer using the Main Out Volume knob.
If there is a hum when cables are connected:
•Disconnect cables from the input jacks to see if it’s a faulty cable.
•Use balanced cabling connections whenever possible.
•Make sure the signal cables are not placed near power cables.
•Connect all audio equipment power cables to outlets which share a common
ground.
If there is a high-pitched whistling noise when using microphones:
•This is probably feedback. Point the microphone away from the speaker.
If you are streaming audio and the quality is choppy:
•Ensure you are connected to a USB 2.0 port.
•Ensure your Wi-Fi connection is strong.
•Try a wired Ethernet connection for lower latency, a more reliable connection,
and a stronger signal.
If there is latency when recording:
•Ensure you are connected to a USB 2.0 port.
•Close all other unneeded programs running on the computer.
•Adjust the buffer size in your DAW, in increments of 64.
(5.0) TROUBLESHOOTING

17
If you cannot connect your audio device to TrueMix 600 via Bluetooth:
•Have your audio device (e.g., smartphone or tablet) and TrueMix 600 as close
together as possible while trying to connect. Make sure both the audio device
and TrueMix 600 are unobstructed by walls, furniture, etc.
•Reset the Bluetooth connection on TrueMix 600 to disconnect it from any other
audio device and restart the search process. If this does not work right away,
power off TrueMix 600 and then power it back on. See the section (4.2)
Operation >Connecting a Bluetooth Device for more information.
•Reset the Bluetooth connection on your audio device by turning Bluetooth off
and back on. You can usually find this under the Bluetooth menu in the Settings
for your phone or other audio device.
If this does not work, and you have connected to TrueMix 600 before, find
TrueMix 600 in the list of available or previously connected devices in your audio
device's Bluetooth menu, tap the "gear" or “i” icon located next to it and then
select Unpair or Forget. Turn TrueMix 600 off and back on and try pairing again
once it reappears in your available devices list.
Note: If TrueMix 600 has been paired to another audio device recently that is still
within range, you may need to repeat this process with that audio device to fully
disconnect.
(5.0) TROUBLESHOOTING

18
(6.1) Technical Specifications
Frequency Response All inputs: 20 Hz – 22 kHz (±1 dB)
THD+N (Total Harmonic Distortion) All inputs: < 0.05% (@ 4 dBu, 1 kHz)
Gain Range Mic inputs (Channels 1-2): 0 - +48 dB
Line inputs (Channels 1-2): -15 – +33 dB
Line inputs (Channels 3-4): -20 – +20 dB
All inputs: +22 dBu max
Max Voltage Gain 67 dB (mic input to any output)
40 dB (line output to any output)
20 dB (2TK/USB/Bluetooth to any output)
SNR (Signal-to-Noise ratio) All inputs: > 110 dBu
Phantom Power +45 ~ +49V with switch control
Impedance Mic inputs: 3.9 kΩ
All other inputs: > 10 kΩ
Aux outputs: 1 kΩ
2TK outputs: 1 kΩ
All outputs: 120 Ω
Equalization High: ±15 dB @ 12 kHz
Low: ±15 dB @ 80 Hz
Bluetooth Profile: A2DP
Module: Bluetooth 5.0
Operating Frequency: 2402 MHz – 2480 MHz
Range: 100 ft. / 30.5 m
USB Audio Interface Version: 2.0
Resolution: 16-bit
DAC Sampling Rates: 32, 44.1, 48 kHz
ADC Sampling Rates: 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz
Connectors (5) 1/4” (6.35 mm) TRS outputs
(6) 1/4” (6.35 mm) TRS stereo L/R inputs
(2) 1/4" (6.35 mm) TRS headphone output
(2) 1/4" (6.35 mm) TRS mono input
(1) Standard RCA L/R input
(1) Standard RCA L/R output
(2) XLR inputs
(1) USB type-B input
(1) DC power input
(6.0) APPENDIX

19
Controls (1) Power switch
(10) volume control knobs (1 per input, 1 aux return, 1 2TK In, 2
headphone out, 1 Bluetooth, 1 Main Out)
(4) Stereo pan control knobs (1 per input)
(4) Aux volume control knobs (1 per input)
(4) EQ Low control knobs (1 per input)
(4) EQ Hi control knobs (1 per input)
(4) Gain control knobs (1 per input)
(3) Locking switch buttons (2 source select, 1 Bluetooth)
(1) Horizontal sliding switch
Indicators (1) Power LED
(4) Peak LEDs
(1) Phantom LED
(16) Main Out Meter LEDs
(1) Bluetooth LED
Main Mix Main output: (2) 1/4" (6.35 mm) balanced TRS, +22 dBu max output
2TK output: (2) unbalanced RCA, +22 dBu max output
Headphone output: (1) stereo 1/4" (6.35 mm) TRS, 170 mW @ 32 Ω
Power Connection: DC
Voltage: 18V, 1A
Consumption: 18W
Dimensions
(width x depth x height)
8.9” x 8.5” x 2.9”
225.5 x 217 x 74 mm
Weight 3.2 lbs.
1.4 kg
Specifications are subject to change without notice. Bluetooth and wireless reception and range are affected by
walls, obstructions, and movement. For optimal performance, place the product in the center of the room so it is
unobstructed by walls, furniture, etc.
(6.2) Trademarks & Licenses
Alto Professional is a trademark of inMusic Brands, Inc., registered in the U.S. and other countries. The Bluetooth
word mark and logos are owned by the Bluetooth SIG, Inc. and any use of such marks by Alto Professional is
under license. macOS is a trademark of Apple Inc., registered in the U.S. and other countries. Windows is a
registered trademark of Microsoft Corporation in the United States and other countries. All other product names,
company names, trademarks, or trade names are those of their respective owners.
(6.0) APPENDIX

Manual Version 1.0