QA Equalizer

QA Equalizer

Full Product

AAX Native, AU, Mac, VST2, Win

in stock
$ 99

 2.67BestCoinBestCoin Bonus 

QA Banner

The Legendary API 550a EQ

QA Equalizer digitally recreates legendary API 550a Vintage American Console equalizer.

This equalizer allows you to chisel your signals with surgical precision. It has a modern, easy-to-use user interface. You’ll love its aggressive structure and proportional Q feature.

Version 1.1.1 features an improved better user interface that is easier on your eyes. This equalizer will keep you running tirelessly even after hours of hard work. You will not be able to help yourself from falling in love with it! QA Equalizer is fast, intuitive and highly responsive. It will unleash your inner mad scientist with the QA plug-in and add a special note to your music.


  • Low Frequency Shelving/Peaking

  • Five selectable center frequencies: 50Hz, 100Hz, 200Hz, 300Hz and 400Hz

  • Mid Frequency Peaking

  • Five selectable center frequencies: 400Hz, 800Hz, 1.5kHz, 3kHz and 5kHz

  • High Frequency Shelving/Peaking

  • Five selectable center frequencies: 5kHz, 7kHz, 10kHz, 12.5kHz and 15kHz

  • Band Pass Filter: Fixed bandwidth: 50Hz to 15kHz

  • The amount of boost or attenuation is continuously variable from -12 dB to 12 dB

  • Extremely High Processing Efficiency

  • Proportional Q narrows filter bandwidth

  • Proprietary topology which is optimized for low latency, low noise and high dynamic range

  • Built-in reference-quality upsampling algorithm which can be enabled at sampling frequencies 44.1 kHz and 48 kHz to achieve bell shape symmetry at high frequencies

  • Supports sampling frequencies up to 384 kHz

  • Clickless parameter update

 Similar Products



  • macOS 10.7 or higher
  • 64 bit
  • Intel Core
  • RAM: 2 GB
  • 1024x768 or higher display resolution


  • Windows 7 or higher
  • 32 bit or 64 bit
  • Intel Core
  • RAM: 2 GB
  • 1024x768 or higher display resolution
Required Registration:

Volko Audio products require you to register with the manufacturer at to activate your license.

This product requires an activation!

An internet connection is required to authorize / activate the product.