The AP4-GM81 provides a 6-channel pre-amp output for use with aftermarket audio equipment. The AP4-GM81 delivers a variable 5v RMS pre-amp output with fading, balance, equalization, and level control capabilities.

The module retains all audio from other vehicle features such as factory navigation prompts, Bluetooth, OnStar, and parking sensor chimes. A data controlled remote amplifier turn on wire is provided by the AP4-GM81. The module provides a variable 2-channel fiber optic digital audio output (TOSLINK).

AmpPRO Amplifier Integration Interface for Select 2023+ General Motors Vehicle Models with BOSE A2B Factory Amplified Systems.

Features:

• Variable volume, fade, balance, bass, mid and treble audio settings
  Front, rear, sub preamp outputs (5 volt RMS)
  
• Customized OE bass, mid and treble center frequency selection
  
• Retains warning chimes, navigation prompts, Bluetooth®, and telematic audio (if equipped) • Plug-and-Play installation
  
• Sub level controller included
  
• TOSLINK optical output provides a variable 2-channel digital audio output

NOTE: The factory amplifier must be unplugged or removed when installing AP4-GM81.

• Important Notes:
  
• This interface is only compatible in vehicles with a BOSE factory amplifier (RPO code UQA or UQS).
  
• The factory amplifier must be disconnected removed from the vehicle when the AmpPRO has been installed.
  
• The remote output is rated at 2A of current. If more current is needed, an external relay must be used.
  
• The remote output is active any time the vehicle data bus is active. Any vehicle interaction like opening a door or pressing a button on the key fob will activate the data bus.
  
• Channel 5 & 6 are non-fading outputs. The output level of channels 5 & 6 can be controlled using the supplied level control knob.
  
• When the non-fading level control knob is not connected to the AP4-GM81, the output level of channels 5 & 6 will default to 100 percent.
  To adjust minimum volume without using the PC APP, the level control knob must be connected.
  
• While adjusting the minimum volume with the USB cable plugged in, the level control knob will not function.
  
• To adjust chime volume, the PC APP must be used.
  
• Chime volume (Front & Rear) can be adjusted through OE Radio under "Settings > Vehicle > Comfort and Convenience > Chime Volume." Before making additional chime volume adjustments with the PC APP, set the OE volume to the middle.
  
• The chime volume and minimum volume levels are set to a typical level by default. If you are happy with this level in your particular application, then additional adjustment is not required. Please refer to the Setup and Configuration section on page 4 for more details.
  
• Front and rear chimes are independently adjustable to compensate for difference in power levels between front and rear installs.
  
• The factory radio's speed controlled volume and surround sound mode are not supported by the AP4 outputs.
  
• When using the TOSLINK output, all chimes must be routed through the front output by setting DIP switch 1 ON (down).
  
• No adjustments can be made manually using the programming button, or the factory SWC, when the module is connected to a PC.
  
• The AP4-GM81 is designed to be installed in the factory amplifier location, NOT behind the radio. It will replace the factory amplifier which will no longer be used.

Shipping Policy

DBs Car Audio is proud to offer fast & free shipping on all items listed in our store!!

Shipping Methods and Transit Times

DBs Car Audio ships orders from our Kissimmee, Florida location. On occasion, orders will be fulfilled directly by the manufacturer or distributor in order to reduce the shipping time..

Order Tracking

Once an order has been shipped, we send our customers an email with the tracking number for the order. Click on the tracking link in the email to follow the location of the package on the carrier's website. If you did not receive a tracking number by email or need to confirm the tracking information, please contact call us at 1-800-927-9390

Signature Required

Due to the valuable contents of some shipments, DBs Car Audio will only require a signature upon delivery if the order is over $500. Such guidelines will not be overruled upon the customer's request. Please understand that this is a security measure taken by our Company to ensure the safe delivery of each package and guarantee excellent service. Many of our third-party shipping carriers and payment companies require signatures upon delivery to protect against fraud and theft. Customers may request a signature upon delivery by emailing us at dbscaraudiofl@gmail.com.

Shipping Policy Disclaimer

Delivery estimates do not apply to items shipped directly from the manufacturer, nor out-of-stock items. Some items that ship from the manufacturer can only be delivered to addresses within the 48 continental states.

Standard delivery time for domestic customers will average from 2-4 business days, but can take longer in some cases. Saturday, Sunday and national holidays are not considered business days for delivery purposes.

Our Shipping Guarantee applies only to shipments delayed due to our service failure. We will not guarantee shipments that are delayed due to an act of god (ex: weather), a catastrophic event, or failure by our delivery partners. Our guarantee is also voided if incorrect billing or shipping information is given and results in your order being delayed to its destination. Our guarantee is also void if no one is available to sign for shipment when delivery attempt is made if a signature is required.