Volko Audio Q American Series

Q American Series Digitally Recreates Legendary API 550a, 550b and 560 Vintage American Console Equalizers*

The equalizers allow you to chisel your signals with surgical precision. They have a modern, easy-to-use user interface. You’ll love their aggressive structure and proportional Q feature. 

QA, QB and QG vintage American console equalizer plug-ins support VST, VST3, AU and AAX plugin formats.

New Better User Interface
Easy On Your Eyes
The 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!

Harmonious Marriage of API 550a
Modern User Interface
You work long hours and deserve better user interfaces without compromising from the sound quality.

Fast, Intuitive and Highly Responsive
Unleash your inner mad scientist with the QA plug-in and add a special note to
your music.

Quality Comes First
The QA vintage equalizer plug-in is highly optimized to keep your CPU under low stress, while still maintaining top quality sound output.

QA Features

• 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.

QB Features

• Low Frequency Shelving/Peaking.
• Seven selectable center frequencies: 30Hz, 40Hz, 50Hz, 100Hz, 200Hz, 300Hz and 400Hz.
• Low Mid Frequency Peaking.
• Seven selectable center frequencies: 75Hz, 150Hz, 180Hz, 240Hz, 500Hz, 700Hz and 1kHz.
• High Mid Frequency Peaking.
• Seven selectable center frequencies: 800Hz, 1.5kHz, 3kHz, 5kHz, 8kHz, 10kHz and 12.5kHz.
• High Frequency Shelving/Peaking.
• Selectable filter type: Shelving or Peaking. Seven selectable center frequencies: 2.5kHz, 5kHz, 7kHz, 10kHz, 12.5kHz, 15kHz and 20kHz.
• The amount of boost or attenuation is continuously variable from -12 dB to 12 dB.

QG Features

• The QG plug-in is a ten-band fixed frequency graphic equalizer divided into one octave increments. The center frequencies of each band are set at 31Hz, 63Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz and 16kHz. The amount of boost or attenuation is continuously variable from -12 dB to 12 dB on all bands.

QA, QB and QG Common Features

• 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.