Architect & Engineer Specifications - 231QXLR
The graphic equalizer shall be a two-channel 31-band type with frequency centers on standard ISO one-third octave frequencies with 12 dB of boost and cut for each slider. Equalization sliders shall have a center detent at 0 dB. Low-noise sliders shall be utilized having a travel of 20 mm. Each channel shall have a slider input gain control with +/-12 dB range with center detent at 0 dB. Bypassing each EQ channel shall be accomplished by a front-panel switch utilizing electronic FET switching to avoid transients and shall have an LED to indicate that the EQ is active. A front-panel low-cut filter per channel at 50 Hz with 12 dB/ octave slope shall incorporate electronic FET switching and shall have an LED to indicate that the filter is engaged. Output level shall be monitored on each channel by a four-LED peak-reading bar graph calibrated to read -10, 0 +10, and +18 dBu.

The input section shall have two inputs per channel—electronically balanced XLR and 1/4" TRS jacks. The output section shall have two outputs—balanced XLR and impedance balanced 1/4" TRS jacks.

A front-panel rocker-type power switch shall provide visual indication with red marking. The power supply shall be internal with two thermally-fused transformers mounted in low hum orientations. The transformers and primary side of the power supply shall be isolated from the secondary and electronics by means of a steel hum isolation shield. The power cord shall be detachable from an international standard IEC 320 power inlet receptacle. Unit shall be constructed to meet or exceed all applicable international safety and regulatory agencies. Unit shall be powered from 120 VAC 60 Hz (or 100 VAC 50/60 Hz, 230 VAC 50 Hz, 240 VAC 50 Hz). Unit housing shall be of all steel construction and shall be rack-mountable in an IEC standard 19" rack and shall occupy a 2U (3.5") rack space. An optional security cover shall be available.

The unit shall be a DOD SR231QXLR or SR231Q Graphic Equalizer.
Specifications
Frequency Response 20 Hz to 20 kHz
Frequency Center Tolerance
5%
S/N Ratio 92dB
THD
0.00%
Input Impedance 40 kOhms balanced, 20 kOhms unbalanced
Maximum Input Level +21 dBu
Output Impedance 102 ohms balanced, 51 ohms unbalanced
Maximum Output Level +21 dBu
Gain +/- 12 dB
Common Mode Rejection >75 dB@60 Hz
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