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API 529 Stereo Compressor

New Product
API 529 Stereo Compressor- front

The API 529 Stereo Compressor is a 500 series unit that implements both modern and vintage compression methods, based on the classic API 2500.

£1,574.17 ex VAT £1,889.00 inc VAT

UK List Price: £1,839.46 ex VAT

UK List Price: £2,207.35 inc VAT

Availability: Available to order

The new API 529 Stereo Compressor combines the distinctive sound of API’s compression technology with the ease and popularity of the API 500 Series format. Carefully designed to deliver a wide range of compression options, the 529 delivers warmth, clarity and punch, whether used for subtle adjustments or heavy compression effects.

Features of the API 529:

  • Continuously variable detented Gain, Threshold, Attack, Ratio and Release controls
  • 10 segment LED meters show Gain Reduction and selectable Input or Output Level
  • Over Threshold LED
  • Patented THRUST® Switch for frequency dependent side chain control
  • 3 selectable compressor curve Knee settings
  • Selectable New or Old switch for feed-forward or feed-back operation
  • Selectable variable or auto compressor make-up gain
  • Three way In/Out including full hard relay bypass
  • Audio circuit uses 2510 and 2520 Discrete Op Amps with transformer output

Based on the unprecedented success of the 2500, the 529 takes many of the features and controls from API’s famous stereo compressor and puts them into the first dual slot 500 series module from API. This stereo compressor features API’s patented THRUST® circuitry for a punchy low end, along with an Old/New switch that lets you choose between classic and modern compression characteristics: Old for vintage-style feedback compression and New for today’s more common feed-forward compression.

The Auto-makeup Gain button lets you adjust ratio and threshold controls without affecting the output level. Using API’s discrete op-amps and transformer technology, the 529 delivers the legendary analogue sound of API. The 529 is backed by API’s unique 5 year warranty.

Dynamics Type


Valve / Solid State

Solid State

Channel Count

Dual Channel


500 Series

Compression Type



1ms - 50ms


50ms - 4s


1:1 - Limit


-20 - +10dB

Digital I/O


High Pass Filter

Thrust Sidechain

Side Chain Input