Axxess AXDSPX-GM31 User manual

AXDSPX-GM31
INSTALLATION INSTRUCTIONS
AxxessInterfaces.com © COPYRIGHT 2020 METRA ELECTRONICS CORPORATION REV. 8/4/20 INSTAXDSPX-GM31
Google Play Store Apple App Store
iOS 12.1 or higher
INTERFACE FEATURES
INTERFACE COMPONENTS
TOOLS & INSTALLATION ACCESSORIES REQUIRED
• Crimping tool and connectors, or solder gun,
solder, and heat shrink • Tape • Wire cutter
• Zip ties • Multimeter
TABLE OF CONTENTS
Installation Options ...............................................2
Installation .............................................................2
Connections ........................................................3-4
Mobile App ........................................................ 5-13
Specifications ....................................................... 14
GM DSP Interface With Pre-Wired Harness
2019-Up
• Includes a DSP (Digital Signal Processor)
• 31 Band graphic EQ
• 10 individually assignable outputs
• Independent equalization on each of the 10 outputs
• Independent high pass, low pass, and bandpass filters
• Each channel can be delayed independently up to 10ms
• Clipping detection and limiting circuits
• Retains factory parking sensor chimes
• Retains OnStar® voice prompts
• Adjustable chime level
• Designed for non-amplified models
• Easy behind the radio installation with pre-wired harness
• Bass knob included for level control of subwoofer amp
• Settings adjusted via Bluetooth® in a smart device application (tablet
or mobile phone), compatible with both Android and Apple devices
• Read, write, and store configurations for future recall
• Password protect feature available in the mobile app
• Micro-B USB updatable
• AXDSPX-GM31 interface
• AXDSPX-GM31 interface harness
• AXDSPX-GM31 vehicle T-harness • Bass knob
APPLICATIONS
Visit axxessinterfaces.com for current application list

2
Adding a sub to a factory system:
This feature offers the ability to add a subwoofer to a factory system. (refer to page 3)
Adding a full-range amp & sub to a factory system:
This feature offers the ability to add a full-range amp and sub to a factory system. (refer to page 4)
Note: The interface provides a 12-volt 1-amp output to turn on aftermarket amp(s). If installing
multiple amps, an SPDT automotive relay will be required if the amp turn-on current of all amps
combined exceeds 1-amp. Use Metra part number E-123 (sold separately) for best results.
1. Remove the factory radio †, then unplug all connectors.
2. Install the AX-DSPX-GM31 vehicle T-harness to the vehicle and make all necessary
connections, but leave the amp turn-on wire disconnected.
3. Plug the AX-DSPX-GM31 vehicle T-harness to the AX-DSPX-GM31 interface.
4. Plug the AX-DSPX-GM31 interface harness to the AX-DSPX-GM31 interface.
5. Download and install the AXDSP-X app from the Google Play Store or Apple App Store .
6. Open the app then select the Bluetooth Connection tab. Follow the instructions to
pair the mobile device to the interface. Refer to page 6 for more information.
7. Scroll to the Configuration tab then select the vehicle type. Press the Lock Down ‡
button to save the configuration. Refer to page 7 for more information.
8. Connect the amp turn-on wire.
9. Adjust the settings in the app as desired. Press the Lock Down ‡ button to save any
new configurations.
† Refer to Metra online for dash disassembly. If Metra makes a dash kit for the vehicle,
disassembly will be within those instructions.
‡ Anytime the interface is locked down the key must be cycled off then back on
INSTALLATION OPTIONS I N S TAL L AT IO N

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Factory Radio
Keep Connected
Any remaining wires
tape off and disregard
Black - Ground
Orange - Control
Bass Knob
Factory Radio Harness
Interface
Any remaining wires
tape off and disregard
Vehicle T-Harness
Blue/White - Amp Turn-On Wire
These outputs can be used for
additional sub amps, or for adding
onto the system at a later date
RCA Jacks
(sold separately)
ADDING A SUB TO A FACTORY SYSTEM

4
ADDING A FULL-RANGE AMP & SUB TO A FACTORY SYSTEM
SUB
Factory Radio
Factory Radio Harness
Interface
Cut the male
connector off and
connect speaker
wires to amp
White / Front Left +
White/Black / Front Left -
Gray / Front Right +
Gray/Black Front Right -
Green / Rear Left +
Green/Black / Rear Left -
Purple / Rear Right +
Purple/Black / Rear Right -
Any remaining wires
tape off and disregard
Vehicle T-Harness
Bass Knob
Blue/White - Amp Turn-On Wire
Unplug connector
Any remaining wires
tape off and disregard
Black - Ground
Orange - Control
An SPDT relay, Metra part number
E-123, is required if the amp turn-on
current of all amps exceeds 1-amp.
RCA Jacks
(sold separately)
Assignable Outputs Labeled CH 6-10
Interface Harness

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MOBILE APP
Setup Instructions
• General information tab for installing the interface.
Continued on the next page

6
MOBILE APP (CONT.)
Bluetooth Connection
• Scan - Press this button to start the Bluetooth pairing process, then select the interface
once it is found. “Connected” will appear in the top left corner of the app once paired.
Note: The ignition must be cycled on during this process.
• Disconnect - Disconnects the interface from the app.
Continued on the next page

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• Disconnect - Disconnects the interface from the app.
Continued on the next page
MOBILE APP (CONT.)
Configuration
• Identify - Click this button to send a test tone to the front left speaker* .
* Only installations using the front left output (white RCA jack).
• Reset to Defaults - Resets the interface to factory settings. During the reset process the amp(s)
will shut off for 5-10 seconds.
• Vehicle Type - Select the vehicle type from the drop down box, then click the apply button .
• Lock Down - Click this button to save the selected settings.
Attention! This must be done before closing the app or cycling the key otherwise all new
changes will be lost!
• Save Configuration - Saves the current configuration to the mobile device .
• Recall Configuration - Recalls a configuration from the mobile device.
• About - Displays information about the app, vehicle, interface, and mobile device.
• Set Password - Assign a 4-digit password to lock the interface. If no password is desired, use
“0000”. This will clear out any currently set password. It is not necessary to lock down the
interface when setting a password.
Note: A 4-digit only password must be chosen otherwise the interface will show “password
not valid for this device”.

8
MOBILE APP (CONT.)
Continued on the next page
Outputs
Output Channels
• Location - Location of speaker.
• Group -
Used to join channels together for simple equalization. Example, left
front woofer/midrange and left front tweeter will be considered simply left
front. The letter M indicates the speaker assigned as the master speaker .
• Invert - Will invert the phase of the speaker.
• Mute - Will mute desired channel(s) for tuning individual channels.

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MOBILE APP (CONT.)
Crossover Adjust
• If installing a subwoofer, the front and rear outputs will default to a 100Hz high pass filter to keep the low frequency signals out. If
a subwoofer is not being installed, change the front and rear crossover points down to 20Hz for a full range signal, or to the lowest
frequency the speakers will play down to.
• Selecting High Pass and Low Pass will provide one crossover frequency adjustment. Selecting Band Pass will provide two crossover
frequency adjustments, one for low pass, and one for high pass.
Continued on the next page

10
MOBILE APP (CONT.)
Equalizer Adjust
• All channels can be adjusted independently within this tab with 31 bands of available
equalization. It is best to tune this by using an RTA (Real Time Analyzer).
• The Gain slider on the far left is for the channel selected.
Continued on the next page

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MOBILE APP (CONT.)
Delay Adjust
• Allows a delay of each channel. If a delay is desired, first measure the
distance (in inches) from each speaker to the listening position, then
enter those values to the corresponding speaker. Add (in inches) to
the desired speaker to delay it.
Continued on the next page

12
MOBILE APP (CONT.)
Inputs/Levels
Continued on the next page
• Chime Volume - Allows the chime volume to be adjusted up or down.
• Clipping Level - Use this feature to protect sensitive speakers like tweeters from
being driven past their capabilities. If the output signal of the interface clips the
audio will be reduced by 20dB. Turning down the stereo will allow the audio to
come back at a normal level. The sensitivity of this feature can be adjusted to the
listening preference of the user.
• Amp Turn On
• Signal Sense - Will turn the amp(s) on when an audio signal is detected, and keep on for
10 seconds after the last signal. This ensures the amp(s) won’t shut off between tracks .
• Always On - Will keep the amp(s) on as long as the ignition is cycled on.
• Turn on Delay - Can be used to delay audio output to avoid turn-on pops.
• Subwoofer Input - Select Front + Rear

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Locking Down Data
Last and the most important.
You must lock down your
configuration and cycle the key!!!
MOBILE APP (CONT.)

14
SPECIFICATIONS
Input Impedance 1M Ohm
Input Channels 6
Input Options High Level or Low Level
Input Type Differential balanced
Input Voltage 0 - 28-volts (peak-to-peak)
(high level range)
Input Voltage 0 - 4.9-volts (peak-to-peak)
(low level range)
Ouput Channels 10
Output Voltage Up to 5-volts RMS
Output Impedance 50 Ohms
Equalizer Type 31 Band Graphic EQ, +/- 10dB
THD <0.03%
Frequency Response 20Hz - 20kHz
Crossover 3-Way LPF, BPF, HPF THP per channel
Crossover Type Linkwitz-Riley 24db slope
Sampling 48kHz
S/N Ratio 105dB @ 5-volts RMS
Operating Voltage 10-16 volts DC
Standby Current Draw 7mA
Operation Current Draw 150mA
Adjustments/Controls Application via Bluetooth
Remote Output 12 volts DC (signal sense
or with ignition

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KNOWLEDGE IS POWER
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Log onto www.installerinstitute.com or call
800-354-6782 for more information and take steps
toward a better tomorrow.
®
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certified technicians
AxxessInterfaces.com © COPYRIGHT 2020 METRA ELECTRONICS CORPORATION REV. 8/4/20 INSTAXDSPX-GM31
INSTALLATION INSTRUCTIONS
AXDSPX-GM31
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