PAC AP4-CH21 Amplifier Integration Interface Compatible with Select Chrysler, Dodge, Jeep, and RAM vehicles with amplified sound systems - Open Box


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AmpPRO simplifies the installation of upgraded amplifiers in data-bus-controlled amplified sound systems. With AmpPRO, you can improve audio performance while keeping an original radio’s fit, finish, and features.

Compatibility Note: This product is compatible with data-bus-controlled amplified systems only. To identify these systems, look for logos on door speakers, tweeters, dash speakers, or the subwoofer to confirm if the vehicle has a compatible amplified system: Alpine, Beats, or Harman Kardon. Vehicle manufacturers do not always brand compatible systems. Unbranded amplified systems are generally identified by locating a center channel speaker or subwoofer.

• Simplifies amplifier installation
• Prevents the need for summing and DSP devices
• Provides factory sound system upgrade solution

• It can be used to upgrade the entire sound system or just part of it thanks to the retention of the original amplifier
• Enables the addition of a subwoofer system to the original sound system
• Variable volume, fade, balance, bass, mid and treble audio settings
• Front, rear, sub preamp outputs (5 volt RMS)
• Provides flat audio output for a solid audio foundation
• Customized OE bass, mid and treble center frequency selection
• Retains uConnect, Bluetooth audio, and all warning chimes
• Plug & play installation
• Sublevel controller
• Optional TOSLINK optical output (APA-TOS1 sold separately)

• AmpPRO module
• 22-pin harness (MS-CAN)
• Bass knob
• Knob harness
• Manual

Used & Open Box Frequently Asked Questions

  • What does used mean? Used products may be unused customer returns that are essentially "new" items, or they may be previously installed products that were returned under warranty or during our return policy period.
  • What is the warranty? All of our used & open box items come with a 90-day warranty.
  • What's it look like? All of our used items are inspected and graded by our returns team at our facilities. They will test them and grade them to one of four standard gradings: Open Box, Used Very Good, Used Good, and Used Acceptable. Please see the following descriptions of each grade - also note that if an item falls under ANY of the criteria for a certain grade, even though the rest of the product is better, we will give it the lowest grade.
  • Open Box An item in perfect working condition. Original protective wrapping may be missing, but the original packaging is intact and in good condition with minor damage possible. Instructions are included.
  • Used Very Good A well-cared-for item with limited use, remains in good working condition. The item may show some limited signs of wear,small scratches,cosmetic blemishes. Item may arrive with damaged packaging or be repackaged and could be missing some accessories.
  • Used Good The item shows wear from use, remains in good condition and functions properly. May have damaged packaging or be repackaged. It may be marked, have identifying markings on it, have minor cosmetic damage. It may be missing some parts or accessories.
  • Used Acceptable The item is fairly worn but continues to function properly. While repackaged; signs of wear can include aesthetic issues; scratches, dents. The item may have markings on it or show signs of previous use. Item may be missing some parts or accessories.
  • Have more questions? Call us, send us a chat, or an email. We'll be able to answer any additional questions you may have.

Extra Information

1.00 LBS
1.0000 lbs
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Warranty Information


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