OEM Audio Plus

Next Level Sound for a Legend

’15+ WRX / STI | System 500


Unmatched clarity, deep bass reproduction and a complete transformation of your listening experience in a minimalist package fashioned specifically for your STI / WRX both in design and acoustics.


System 500

amplifier, subwoofer, & tweeters


Kit Includes

  • Multi-Channel 64-Bit DSP Power Amplifier
  • O+ Signature Sound Reproduction
  • WRX/STi-Specific Subwoofer System
  • Dedicated Subwoofer Amplifier w/ Gain Control Knob
  • Front 1″ Soft Dome Tweeter
  • Quick-Sync Wiring Harness



  • 360 Watts RMS (Continuous / @ 2-ohms) 
  • Cirrus-Logic 64-Bit Digital Signal Processing
  • Real-time system diagnosis for trouble-free operation 
  • Meets all OEM standards including AEC-Q100


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


  • Adds More Headroom + Low-Frequency Extension
  • 500 Watts RMS
  • Class D (95% efficient)
  • Includes Gain Control Knob for precision adjustability


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


  • Silk soft dome
  • 4-ohms
  • 50W RMS (100 Peak)
  • Sensitivity 91.8 dB (1 W,1M)
  • Frequency Response: 3,000-20,000 Hz
  • Built-in 6db/Oct. High Pass Filter
  • Neodymium Magnet Structure

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.

Engineered to perform together.

By optimizing our sound solutions as "Systems" as opposed to "parts" we are able to take sound reproduction within this space to a level that hasn't been done before - all the while performing real-time diagnosis via our Digital Signal Processor. This level of scrutiny and control results in a powerful experience without fear of blowing a speaker, taxing your vehicle battery, inducing distortion or any other type of variable that may interrupt your enjoyment.


• Superior clarity, dynamics, volume, and impact
• We guarantee our signature sound reproduction with your current door speakers (as unfathomable as that seems). This is accomplished as a result of our tuning process.


  • All the emotional weight of your music
  • 14-liter sealed fiberglass cabinet
  • Installs using existing mounting locations

Amplification (2)

Highly efficient Class HD Speaker Amplifier
• Powers and remasters all speakers + subwoofer
• Superior dynamics, volume, and impact
• 360 Watts RMS (Continuous / @ 2-ohms)
Subwoofer Amplifier
• Subwoofer gain control knob.
• 320 Watts RMS (Continuous / @ 4-ohms)

64-Bit Digital Signal Processing

• Calibrated to deliver high-resolution audio upon plug in
• You can expect seamless, full-range, detailed sound reproduction
• Extremely powerful 64 bit processing power and sound optimization
• 295 MHz DSP Chip | Class HD Topology

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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