OEM Audio Plus

Next Gen Sound for a Next Gen Legend

2022+ Subaru WRX w/ HK Enhancement


OEM Audio Plus is proud to bring offer our signature sound reproduction and seamless integration to the Harman Kardon equipped 2022+ Subaru WRX/STI. More than “just a sub” the HK Enhancement delivers improved dynamics and clarity and deep, non-localized bass reproduction, all the while preserving ALL your vehicle functionality.

Installation Difficulty

Audio Upgrade

amplifier & subwoofer

ATTENTION: Compatibility with the 22+ WRX GT is in the process of confirmation. Reach out to us at [email protected] for more information. 



Kit Includes

  • Acoustic Correction Filters
  • 8” Quad-Coil Subwoofer System (Carbon Fiber Cone Technology)
  • Dedicated Subwoofer Amplifier (400 Watts RMS)
  • Subwoofer Gain Control Knob
  • Quick-Sync Wiring Harness



  • 8″ Dual Voice-Coil Subwoofer
  • Genuine Carbon Fiber Cone Woofer
  • 100W RMS (200 Peak)
  • Sensitivity 88.9dB (1 W,1M)
  • Frequency Response: 20 -1000 Hz


  • Class D (95% efficient)


  • Correction of excessive sibilance and edginess from the dash speakers.
  • Removal of muddy-ness attributable to front door woofers.
  • Improved transparency between all the speakers resulting in a coherent sound reminiscent of high quality bookshelf monitors or studio near-field monitors.
  • Improved imaging, stereo separation and seamless integration with the subwoofer.


  • Maintains all factory functionality
  • Constructed of genuine OEM connectors
  • Fuse Holder Assembly is element proof butt-connectors w/ built-in solder
  • < 4lbs / 1.8kg

Clean Crisp Clear

Refining the sound is a process on its own. Objective adjustments take you only so far. The ultimate test is our ears and the final sound is only achieved through extensive listening sessions amongst company peers. What you’re hearing is OEM Audio Plus.


• Highly efficient Class HD amplifier
• Superior dynamics, volume, and impact
• 60W x 4 RMS (Continuous / @ 4-ohms)
• Huge power in a tiny package


  • 27-Liter sealed fiberglass cabinet
  • Mounts using factory hardware locations
  • Non-invasive design preserves cargo area space


Highly efficient Class HD Speaker Amplifier
• Superior dynamics, volume, and impact
• 60W x 4 RMS (Continuous / @ 4-ohms)
Subwoofer Amplifier
• Subwoofer gain control knob.
• 360 Watts RMS (Continuous / @ 4-ohms)

64-Bit Digital Signal Processing

• Calibrated to deliver high-resolution audio upon plug in.
• Extremely powerful 64 bit processing power and sound optimization
• 295 MHz DSP Chip | Class HD Topology
• Full Digital: Optical Toslink SPDIF Connectivity

It sounds unbelievable. Really what I was impressed with was the placement of the front stage. The vocals and the strings can clearly be pulled out of the music

Sean Hollman

Motor Trend

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