Dual 31-Band Constant Q Equalizer
The DOD SR231Q is a powerful 2 rack space
stereo/dual mono 31-band graphic equalizer of
uncompromising quality, performance, and features.
It allows the user to see a graphic representation of
equalization applied to the audio spectrum of a
sound source, and offers the flexibility to provide
solutions to many EQ problems. The SR231Q offers
up to 12 dB of cut or boost per band, and switch-
able low cut filters for each channel. Electronic fil-
ter switching minimizes transients (loud pops or
clicks when the switch is depressed), and up to
±12 dB of level control is available to compensate
for gain changes due to equalization boost or cut.
Constant Q constant bandwidth from each filter
throughout the full audio spectrum. The SR231Q
can be used as a stereo equalizer or as two inde-
pendent channels of equalization, providing maxi-
mum flexibility for all sound systems. Connections
to the SR231Q may be either impedance balanced
(1/4" tip-ring-sleeve phone plug) or unbalanced
(mono 1/4" phone plug) with XLR connectors avail-
able as a factory option.
Low Cut Filter: 12 dB/octave rolloff, 3 dB down @ 50 Hz,
switchable in or out.
Frequency Response: 20 Hz-20 kHz, ±0/-0.5 dB.
Frequency Center Tolerance: 5%.
Slider Control Range: 12 dB cut/boost.
Input Impedance: 40kΩ balanced, 20kΩ unbalanced.
Maximum Input Level: +21 dBu.
Output Impedance: 102Ω balanced, 51Ω unbalanced.
Maximum Output Level: +21 dBu.
Input Gain Control: ±12 dB.
Harmonic Distortion: 0.004% at 1 kHz typical.
Signal-To-Noise Ratio: Greater than 90 dB.
Note: 0 dBu = 0.775 Vrms.
Input Common Mode Rejection: >75 dB@60Hz
SPECIFICATIONS
• 31 1/3 Octave Standard ISO Center
Frequencies Bands per channel
• Constant Q Filter
• 12dB of Boost/Cut per Band using Low
Noise Potentiometers
• LED Bargraph Level Indicators
• Low Cut and EQ In/Out Switches with
LED Indicators
• Balanced/Unbalanced input and
impedance bal/unbal outputs for each
channel
• Front Panel Power Switch
• 1/4" Phone connectors (XLR Optional)
• 2 Unit Rack Space
• One Year Limited Warranty
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