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
– 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
– this 6 position switch selects the type of saturation applied to
signal. The associated
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 graphs and specifications for detail.
SWITCH LINKING
– from REQ serial number Q1115, a new system control
board has been fitted which allows the
HIGH PASS FILTER
,
SYSTEM
and
SATURATION
in/out switches to be linked. Once linked, you only need to
push either the A or B channel switches to change both channels together.
To link the functions, press and hold down any of the six switches for 4
seconds. To un-link, press and hold down again any of the six switches.
6] Specifications
Frequency Response
Measured with all eq bands ON set flat, Saturation and HPF OFF ........ 5Hz to 0.2/-3dB
See graphs 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 ba26dBu 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. Specifications are typical of a production unit, and subject to change if
we improve something.
