Q2 Audio F765 COMPEX 500
Q2 Audio F765 COMPEX 500
Q2 Audio F765 COMPEX 500

Q2 Audio F765 COMPEX 500

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Manufactured by Q2 Audio in close collaboration with Audio & Design, the F765 is a remake of the classic F760-N module and has now been adapted to the 500 series modular rack system. It is authentic in every detail and reproduces the exact sonic qualities of the original product.

Using the original discrete analogue circuit design employing a feedback FET technique and maintaining the use of the same components that give this product such a distinctive sound, the new F765 compressor/limiter will add dynamic punch to your sound as well as controlling peak excursions.

The original F760-N module was used by major recording artists worldwide throughout the 60s, 70s, and 80s. This famous, iconic processor was instrumental in shaping the sounds of that era. Now as the F765 it returns to take a worthy place in the ever-popular 500 series rack system with it's unique signature on the sounds of today.

  •     Single channel level control offering simultaneous compression gain reduction with peak limiting
  •     Precision calibrated compressor/limiter threshold control which allows the user to “dial up” the amount of compression required before peak limiting occurs
  •     Switched Compression values from 1:1 (amplifier), 2:1, 3:1, 5:1, 10:1 & 20:1 (limiter)
  •     Auto dual platform release function – allows fast transient recovery on a “build-up” slow release
  •     Gold contact rotary switches
  •     Gold contact toggle switches
  •     Conductive plastic potentiometers
  •     PCB headers for possible future connection to E900 type EQ
  •     Sidechain Insert and Bus output functionality per Radial Engineering specs
  •     Sidechain insert is jumpered by default
  •     Sidechain insert send minimum external load of 10K
  • Input: 10K ohms Unbalanced
  • Output:  Transformer Balanced (Cinemag CMOB-3L) Max output: 20dBu, 18.5dBm
  • Metering:  Sifam Fast Responding analog meter
  • Stereo Linking:  Must ordered as stereo pair for proper stereo performance
  • Power requirements:  +/-16V DC @ 70mA per rail (brief 400mA turn-on surge)
  • System Gain:  34dB with input/output attenuators fully open. Unity gain in Bypass mode
Peak Limiter: +14dBu maximum with unattenuated output. Referred to unattenuated input level 20dBu
Compressor:  Calibrated with reference to Peak Limiter thresholds and marked 0 – 20dB in 2dB steps. (Reference to unattenuated input level this is -20dBu to -40dBu)

Peak Limiter: 250mS,
Compressor: 25mS, 50mS, 100mS, 200mS, 400mS, 800mS, 1.6 secs, 3.2 secs + Auto release function

Peak Limiter: < 250uS for 100% control of overshoot – without any over limiting. (measured at 1KHz for 10dB gain reduction)
Compressor: 250uS, 2.5mS, 25mS

Distortion:  Measured at 1KHz for 10dB compression & 3.2 secs release time.
Compressor: at +10dBu threshold <0.1% (typically 0.04%)
Peak Limiter: at +14dBu threshold <0.3%

Frequency Response:
Balanced: < -0.5dB at 20Hz & < -0.75dB at 20KHz

Signal – Noise Ratio:
Referred to Peak Limiter threshold level as set by output attenuator: better than -80dB (Measured with low pass filter -3dB at 25HKz)

Stereo Matching:
Control volts matching on compressor to within ±1dB of each other, consequently no image shift during operation
Selectable Peak Limiter operation
Peak Limiter on – off or Pre-emph (50uS time constant)

Overall Gain Reduction Meter scaled 0 – 20dB in 4dB divisions. White scale on black background with yellow pointer
Peak Limiter operating: Red indicator

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