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MINI Cooper X9331 Complete Signal Wiring T-Harness

Availability: In stock
$199.00

SAVE $50.00

$149.00

This is our complete integrated signal wiring harness from our Soundstage™ system for 2nd gen MINI Coopers. Use this harness to install any combination of amplifier, subwoofer, and/or new front speakers. NOTE: this harness does NOT ship with a front speaker pass thru, so you must be replacing the amplifier for this to work.


  • Plugs into the factory X9331 connector
  • Provides low-level RCA outputs and speaker inputs for front speakers and a subwoofer. [Rear speaker signal and input is available by making a manual connection at the X9331 T-harness portion]
  • Includes wiring for tweeters for vehicles that did not have them from the factory
  • Provides a remote turn on signal for amplifiers
  • Includes a dash-mounted remote level control for the subwoofer channel
  • Works in all R55, R56, R57, R58, R59 vehicles (Not sure which model you have?  Check here.)
  • Does NOT work with R50/R53, R52, R60/R61, F55, or F56.
  • Works with any factory audio option (10-speaker HIFI/HK and 6-speaker Standard).
  • Note that 10-speaker HIFI/HK vehicles must manually tap into the front speaker wiring at the HIFI/HK amp or run new wire to the doors. See Soundstage instructions for details for your vehicle.
  • Contains passive circuitry to enable proper operation with the output transistors in the MINI headunit.   (If you're having problems with an existing installation because you used basic wiring, this will fix it for you ;)

PLEASE NOTE: This is an unsupported product!  We make this harness available only as a favor to the DIY audio community.  We can not assist you with troubleshooting installations of other equipment.  This harness is a simple pass-thru, outside of testing/exchanging/refunding a defective harness, we can provide no support.

Find an Installer near you:

Looking for a qualified professional to handle installation for you? Use our Find An Installer page.

Do it yourself:

Prefer to do it yourself? We've got you covered. Our installation instructions are the best around. If you can handle moderate around-the-house-DIY projects, you can handle this.

  • For instructions go to the Soundstage product page/installation instructions for your specific vehicle.


These are some of the most common questions about our X9331 harness for the MINI Cooper. Still don't see what you're looking for? Ask Us and we'll get you an answer lickity-split.

  • Will this work in an R60 Countryman?

    No, sorry. The R60 Countryman uses a different connector.

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