• 24 bit A/D and D/A
• 32-bit DSP
• Independent display and control of A & B channels

• 31 digital filters on ISO 1/3 octave center frequencies, width adjustable⁴ (GRQ Remote) from 0.5 to 1.0 octave in .01 octave increments
• + 6 or 12 dB boost and cut range

• Twelve independent digital filters per channel, controlled automatically or parametrically from 20 Hz to 20 KHz, each switchable between FBX fixed filters, FBX dynamic filters, and parametric filters⁴
• Filter depth: user-controllable in 1 dB steps from +12 dB to -84 dB (parametric mode), 3 dB steps from 0 dB to -40 dB (FBX mode), max. automatic depth adjustable from -6 to -40 dB
• Filter width: user-controllable from 9.99 to .01 octave (parametric), 1.0 to .01 octave (FBX ¹)
• Low Cut Filter: user-controllable between 20 Hz and 3 KHz; 12 (or 24⁴) dB/octave roll-off
• High Cut Filter: user-controllable between 1 KHz and 20 KHz;  12 (or 24⁴) dB/octave roll-off
• Resolution: 1 Hz from 20 Hz to 20 KHz in FBX and parametric mode
• Time required to find and eliminate feedback: typically 0.3 seconds @ 1 KHz
• Total number of combined filters active per channel: user-selectable, 0 - 12; plus low and high pass filters

• Threshold:  +30 dBV to -30 dBV in 0.5 dB steps (independently adjustable for compressor & limiter⁴)
• Ratio:  1:1 through infinity
• Knee:  soft/hard, in 40 steps⁴
• Attack:  1to 99 msec in 1 msec steps⁴
• Release:  .05 to 5 sec in .05 sec steps⁴
• Peak limits:  +32 dBV to -30 dBV in 0.5 dB steps⁴
• Mode: Dual Mono or Stero (GRQ3122 & 3122-S)

• 1.38 to 999.96 msec in 20 microsec steps
• Programmable in milliseconds, feet or meters

Crossover

• 1x2: Bessel, Linkwitz-Reily, and Butterworth filters; 12, 24, 36, 48 dB/octave slopes

Password Configuration

• 4 levels (GRQ Remote)⁴

• GRQ-3122, 3121: Front panel, GRQ Remote (RS 232), Remote switching
• GRQ-3122S, 3121S: GRQ Remote (RS 232), Remote switching

• 20 user defined
• 1 factory default
• 1 most recent configuration (power down save)
• 1 default front panel

• Input impedance: Balanced 10K Ohms, PIN 2 high
• Output impedance: Balanced 10 Ohms nominal, PIN 2 high
• Input/Output maximum signal levels: Balanced +18 dBV peak input, Balanced +18 dBV output ²
• Output load: (600 Ohms balanced)
• Bypass: true power-off bypass
• I/O connectors:  XLR-3, 1/4" TRS
• GRQ-3122 and 3122-S:  Dual channel, one input and one output per channel
• GRQ-3121, and 3121-S: Single channel, one input, two parallel outputs.  Functions on each output selectable via GRQ2-Remote

• Frequency response:  10 Hz to 20 KHz, + 0.2 dB @ +18 dBV
• THD:  <0.01% at 1.0 KHz at +18 dBV with 30 KHz Bandwidth
• SNR ³:  >105 dB
• Dynamic Range: 110 dB
• Headroom: +14 dB  peak @ 4 dBV nominal input

• Operating system firmware stored in Flash RAM.  All future upgrades for firmware and software downloadable from Sabine website using Upgrade Wizard.

• 50/60 Hz available in 100 V, 120 V, 230 V;  18W

• 2-U rack mount: 19 x 3.5 x 9.5 in. (48.3 x 9 x 22.9 cm); 9 lb. (3.9 Kg)
• 1-U rack mount: 19 x 1.75 x 9.5 in. (48.3 x 4.5 x 22.9 cm); 8 lb. (3.6 Kg)

¹ Below approximately 200 Hz the feedback filters become slightly wider to increase the feedback and rumble capture speed at these low frequencies.

² Note: Inputs may be balanced or unbalanced.  For maximum output capability, outputs must be balanced (XLR or TRS).  If either side of an output is grounded, the peak output and dynamic range will be reduced by 6 dB.

³ Signal-to-noise ratio is the ratio of the maximum undistorted signal by specification (26 dBV RMS sinewave) to the noise floor

⁴ Adjustable with GRQ2 Remote only.

⁵Tests performed using an Audio Precision System One model 322 or equal

(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)