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Pendulum Audio OCL-500 500 Series Compressor  From Pendulum

Pendulum's legendary proprietary opto cell in a 500-series solid-state compressor package!

Pendulum Audio

Manufacturer's Description from Pendulum

Since its introduction in 1998, the Pendulum OCL-2 Compressor/Limiter has become a modern classic. In fact, the OCL-2 changed the way users think about opto compression! Our custom opto cell provides fast, invisible compression without the artifacts and sluggish response inherent in vintage designs.
The new OCL-500 has the same compression circuit as the OCl-2, but uses a transformerless class A solid state gain makeup circuit in place of the tube stage. The result is clean, transparent compression that can be used to shape the dynamics of any source while preserving its tone. Like the OCL-2, the OCL-500 has a wide variety of time constants and dynamic control to optimize the compression characteristics, including a sidechain hi-pass filter.


  • OCL-2 compression profile with our proprietary opto cell
  • Six time constants with fast, rms, multi-slope and average
  • Class A solid - state (no tubes)
  • Sidechain hi-pass filter
  • Single-space 500 series rack format
Pendulum Audio

About Manufacturer

Pendulum Audio specializes in high-quality, hand-built vacuum tube recording equipment and electronics designed for amplifying stringed instruments. Since 1988, our Preamp Systems for Acoustic Instruments have been the choice of musicians worldwide who are serious about their sound - both on stage and in the studio. In 1998, we debuted a line of class A tube mic preamps and dynamics processors, which have quickly become modern classics.


Format: API® 500 series standard, fully compatible
Input Impedance: 20K!, balanced
Output Impedance: less than 50!
Max. Output Level: +27dBu, balanced
Threshold: off to 20dB of gain reduction at +4dBu
Ratio: 1.5:1 to 15: 1, soft knee
Output: Off to +20dB of makeup gain
Max. Gain Reduction: 27 dB
Frequency Response: +/- 1 dB from 10Hz to 95kHz
Noise Level: better than 78dB below +4dBu, 0-30kHz
Total Harmonic Distortion: less than 0.01% with no compression






Pendulum OCL-500 PDF