API Audio 565

Discrete Filter Set


API Audio 565 Features

  • Sweepable low-pass filter (500Hz to 20kHz, -6 or -12dB slope)
  • Sweepable high-pass filter (20Hz to 400Hz, -12 or -18dB slope)
  • Variable notch filter with adjustable Q (fully sweepable between 20Hz and 20kHz)
  • Individual bypass switches for each filter section
  • Transformer Balanced Output to +28 dBu
  • Traditional API fully discrete circuit design
  • Uses API 2520 and 2510 Op-Amps as well as the same discrete transistor buffers used in the famous 550 series equalizers

The 565 Filter Bank module has circuits that are true to the musical filters of the famed 215 module found in large format API consoles.


Number of Bands: Three
Filter Types: Sweepable Shelf Low Pass
Sweepable Shelf High Pass
Adjustable Active Twin-T Notch
Filter Frequencies: Low Pass: 500Hz to 20kHz
High Pass: 20Hz to 600Hz
Notch: 20Hz to 20kHz (3 selectable ranges)
Notch Filter Q: Variable from 0.95 to 15.3
Notch Filter Cut: > 40dB at minimum Q setting
Input Impedance: > 20K Ohms, Balanced
Output Impedance: 75 Ohms, Transformer Coupled, Balanced
Nominal Levels: -15dBu to +15dBu
Clipping Level: +28dBu
Frequency Response: +.2, -.4, 20Hz to 20kHz
THD+N: 0.02% (+4dBu output @ 2kHz)
Connector: 15 position .156″ sp. edge connector
Power Consumption: +/-16VDC, 100mA max at +24dBu out
Size: 1.5″ x 5.25″ x 6.75″ Deep

Additional information

Dimensions 6 × 7 × 2 in