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The REQ is available in two versions. The recording version uses quality Alps variable pots for the cut/boost controls and offers +/-16dB of range. The mastering version uses light to the touch 23 position Elma switches for the cut/boost controls with +/- 8dB range and 0.5dB steps. In both versions, all other controls are switched. The high pass filter section of the mastering version has a softer slope (12dB/oct) compared to the recording version (18dB/oct) and the cutoff frequencies are more applicable to the mastering process (see the frequency chart below).
The low and high bands can be switched between bell curve or shelving curve. In shelf mode the bandwidth control converts to a shelf "slope" control allowing the user to vary the steepness of the shelf curve. The two mid bands are fixed as bell curves and feature two frequency ranges (x1/x2.5) to cover a large range of choices. The high pass filter has 6 frequency selections and the saturation circuit has 6 settings with different flavours (see the distortion specs below). All bands have their own bypass switch as does the saturation and high pass filter sections and a global bypass is provided. A peak led monitors the internal levels at each band and illuminates when the level reaches +22dBu.
We are now offering an option for the Low Band section of the REQ. This option replaces the Choke based filter with an Active filter which provides a "tighter" bass sound. This option has come about from requests from some users who work with modern music styles in mastering. The only operational difference between the Active and Choke filters is in Shelf mode, the Bandwidth control is disabled.
Ordering model numbers
• Recording version with choke filter low band - REQ-2.2
• Recording version with active filter low band - REQ-2.2 A
• Mastering version with choke filter low band - REQ-2.2 ME
• Mastering version with active filter low band - REQ-2.2 MEA
The Active cards can be easily fitted to existing units
Measured with all eq bands on and set flat, Saturation and HPF off = 5Hz to 125kHz +0.2/-3dB
• Harmonic Distortion at +10dBu signal level;
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
• 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 output level (A weighted)
• 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.
|Type||4 bands Parametric EQ|
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