Full Features List

  • Stepped controls (21 positions) for easy recall and stereo operation
  • Anodized aluminum knobs and front panel
  • Unique, custom opto assembly that replicates the original
  • 10-LED gain reduction meter
  • Switchable wet/dry MIX knob
  • Pushbutton select switches:
    • LIM switches between compress (2:1) and limit (selectable) modes
    • HPF filters low-frequencies out of the sidechain (150Hz)
    • MIX engages the wet/dry mix control
    • LINK enables stereo linking (But we do not recommend the OLA5 as a bus compressor. See the FAQ tab for more info.)
    • IN engages the compressor
  • Optional vintage DOA/transformer output section
  • Kit includes every component required to build the OLA5
  • Step-by-step manual and guaranteed support 
  • Fully compatible with the 500-series format
  • Horizontal front panels available separately


More Info on this product at DIYRE

OLA5 Opto Compressor

Excluding Sales Tax
  • Classic Opto Leveling, Upgraded Signal Path. The Urei LA-4 leveling amplifier has always lived in the shadows of it's older siblings, the LA-2A and LA-3A. Despite possessing the distinctive, musical compression character its family is known for, the LA-4 was compromised by the muddy sound of early chip technology.

    With the OLA5, we've painstakingly recreated the LA-4's leveling behavior—including cloning the original opto cell after finding that no modern substitute would do—but that's where the resemblance to the LA-4 ends. The OLA5's signal path is completely overhauled and upgraded. And the workflow hews closer to the LA-2A and LA-3A, while adding new features like a sidechain high-pass filter and parallel MIX control.

    Modern Clarity or Vintage Tone. As with the EQP5 Equalizer Kit, you can choose between the Modern output stage for more transparency or the Vintage output for a thicker, more colored sound. If both outputs are installed, you can switch between them without any soldering. The vintage output includes our 2523 transformer which is based on the 2503 output transformer found in vintage API consoles. You can complement the transformer with our RED-25 DOA, or use your own DOA (the vintage output requires both the DOA and transformer to work). 

    A Challenging, Rewarding Build. The OLA5 is our most complex kit yet, with over 150 parts, and as such we recommend it for intermediate-to-advanced builders. Like all DIYRE kits, the OLA5 comes with detailed, step-by-step directions and email support.

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    • UPS Express Saver as Option in Checkout
    • Free Standard Shipping in Europe on orders over 100€

    Return of untouched Original Products is possible during a time of 14 days after receiving your article, check our Return Policy