Manual

8
standard version. The mastering version has a different set of frequencies
optimized for stereo program equalisation. See the graphs at the end of
this manual for more detail.
SYSTEM
SYSTEMSYSTEM
SYSTEM – these switches are used to completely bypass the REQ. When not
illuminated, the REQ input XLR connectors are directly connected to the
output XLR connectors providing a hard wire bypass. Note that the REQ still
does receive signal at it’s input when bypassed.
SATURATION
SATURATIONSATURATION
SATURATION – this 6 position switch selects the type of saturation applied to
signal. The associated ON
ONON
ON switches engages the saturation circuit when
illuminated. The saturation control changes the low frequency response of
the REQ as well as introducing low frequency harmonics generated by the
steel audio transformer. See the graph at the end of the manual for detail
on the frequency response changes for each switch position. The
harmonic distortion generated by the saturation circuit is given in the
specifications section.
6
66
6] Specifications
] Specifications] Specifications
] Specifications
Frequency Response
Frequency ResponseFrequency Response
Frequency Response
Measured with all eq bands ON set flat, Saturation and HPF OFF ........5Hz to 125kHz +0.2/-3dB
See graphs for typical eq and HPF frequency response measurements.
Harmonic Distortion
Harmonic DistortionHarmonic Distortion
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
Maximum Input LevelMaximum Input Level
Maximum Input Level.....................................................................................................+25dBu
Input Impedance
Input ImpedanceInput Impedance
Input Impedance ........................................................................................... approx 20k ohms
Maximum Output Level
Maximum Output LevelMaximum Output Level
Maximum Output Level............................................+32dBu balanced…+26dBu unbalanced
Output Impedance
Output ImpedanceOutput Impedance
Output Impedance...........................................................................................approx 70 ohms
In
InIn
Input Common Mode Rejection
put Common Mode Rejectionput Common Mode Rejection
put Common Mode Rejection (ref 0dBu) ................. 100Hz -65dB…1kHz -65dB…10kHz -60dB
Noise
Noise Noise
Noise all bands ON set flat........................................-110dB below max input level A weighted
General
GeneralGeneral
General
Power requirements .......................................................... 115V/230V selectable on rear panel
Dimensions...................................................................................4U rack mount, 300mm deep
0dBu = 0.775V RMS in these specifications. Specifications are typical of a production unit, and subject to change if
we improve something.