The REQ is a combination of passive filter circuits and active amplifier stages. Parallel resonant chokes and capacitors form the frequency selective part of each band and these are coupled into the amplifier stage via the boost/cut control. The resulting equalisation is best described as "surreal" and it never sounds hard or harsh. The low frequencies remain tight and powerful with the high frequencies clear and well defined. REQ-2.2 standard recording version with +/-16dB continuously variable boost/cut REQ-2.2 MP mastering version with +/- 8dB boost/cut via 23 position PALAZZO brand switches REQ-2.2 ME mastering version with +/- 8dB boost/cut via 23 position ELMA brand switches
Frequency Response
Measured with all eq bands ON set flat, Saturation and HPF OFF 5Hz to 125kHz +0.2/-3dB
See graphs in side bar above for typical eq and HPF frequency response measurements.
Harmonic Distortion
At +10dBu, Saturation OFF 100Hz 0.007%...1kHz 0.004%...10kHz 0.007%...100kHz 0.013%
Saturation ON POS-1 20Hz 1.5%...100Hz 0.07%...1kHz and up 0.01%
Saturation ON POS-2 20Hz 1.5%...100Hz 0.14%...1kHz and up 0.01%
Saturation ON POS-3 20Hz 1.5%...100Hz 0.16%...1kHz and up 0.01%
Saturation ON POS-4 20Hz 1.6%...100Hz 0.17%...1kHz and up 0.01%
Saturation ON POS-5 20Hz 1.7%...100Hz 0.18%...1kHz and up 0.01%
Saturation ON POS-6 20Hz 2.0%...100Hz 0.22%...1kHz and up 0.01%
Maximum Input Level +25dBu
Input Impedance approx 20k ohms
Maximum Output Level +32dBu balanced…+26dBu unbalanced
Output Impedance approx 70 ohms
Input Common Mode Rejection (ref 0dBu) 100Hz -65dB…1kHz -65dB…10kHz -60dB
Noise all bands ON set flat -110dB below max input level A weighted
General
Power requirements 115V/230V selectable on rear panel
Dimensions 4U rack mount, 300mm deep
0dBu = 0.775V RMS in these specifications. Specification are typical of a production unit, and subject to change if we improve something
