API 529 Stereo Compressor – 500 Series

95 out of 100. Incorporating 10+ ratings and reviews.

Gearank High Notes

Gearank Recommendation

The API 529 appeared on our recommended list for 500 Series Compressors in December 2020 where it remained until November 2022 when it was out-ranked by the WesAudio _DIONE.

Rating Source Highlights

Website Source *Rating Value
Sound On Sound Bob Thomas 98/100
Mix Barry Rudolph 94/100
NAMM TEC Awards Editor 100/100
*Displayed values are prior to the Gearank Algorithm’s adjustments it makes when evaluating the source.


The API 529 shares several similarities with its big sibling, the 2500.

It implements API’s Thrust technology as well as vintage and modern settings for different applications.


  • Controls: Threshold, Ratio, Attack, Release, Make-up Gain (manual/auto)
  • Input/Output Impedance: Not specified by manufacturer
  • Maximum Input Levels/Output Levels: +28dBu.
  • Attack: 1 to 50 ms
  • Release: .05 to 4 sec
  • Ratio: 1.5:1 to infinite
  • Threshold: -20dB to +10dB /li>