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B2-GRQ-OpGuide-v9-031020.pmd
Section Eleven: Graphi-Q2 Engineering Specifications
DIGITAL PROCESSING
24 bit A/D and D/A
32-bit DSP
GRAPHIC EQUALIZER
31 digital filters on 1/3-octave ISO center frequencies, width adjust-
able from 0.5 to 1.0 octave in .01 octave increments; ±12 or 6 dB
boost and cut
±6 or 12 dB boost and cut range
Independent display and control of A & B channels
FBX/PARAMETRIC FILTERS
Twelve independent digital filters per channel, controlled auto-
matically or parametrically from 20 Hz to 20 KHz, each switchable
(GRQ2 Remote) between FBX fixed filters, FBX dynamic filters, and
parametric filters¹
Filter depth: user-controllable in 1 dB steps from +12 dB to -84 dB
(parametric mode); 3 dB steps from 0 dB to -80 dB (FBX mode),
max. FBX depth adjustable from -6 to -80 dB
Filter width: user-controllable from 9.99 to .01 octave (parametric),
1.0 to .01 octave (FBX*)
Low Cut Filter, user-controllable between 20 Hz and 1 KHz; 12 dB/
octave roll-off
High Cut Filter, user-controllable between 3 KHz and 20 KHz; 12
dB/octave roll-off
Resolution: 1 Hz from 20 Hz to 20 KHz, FBX & parametric mode
Time required to find and eliminate feedback: typically 0.3 seconds
@ 1 KHz
Total number of combined filters active per channel: user-select-
able, 0-12; plus low and high cut filters
CROSSOVER
1x2; available in all Graphi-Q2 units
Bessel, Butterworth, Linkwitz-Reily filters
Slopes: 12, 24, 36, and 48 dB/octave
DIGITAL COMPRESSOR/LIMITER
Threshold: +32 dBV to -30 dBV peak in 0.5 dB steps
Ratio: 1:1 through infinity
Knee: variable soft/hard
Attack: 1 to 99 msec in 1 msec steps¹
Release: .05 to 5 sec in .05 sec steps¹
Peak limit threshold: +32 dBV to -30 dBV peak in 0.5 dB steps¹
DIGITAL DELAY
1.38 to 999.96 msec in 20 µsec steps
Programmable in milliseconds, feet or meters
PASSWORD CONFIGURATION
4 levels¹
CONTROLS
GRQ3122, GRQ3121: Front panel, GRQ Remote (RS-232), Re-
mote switching
GRQ3122-S, GRQ3121-S: GRQ Remote (RS-232), Remote switch-
ing
SAVE & RECALL CONFIGURATIONS¹
20 user defined
1 factory default
1 most recent configuration (power down save)
1 front panel
INPUT/OUTPUT**
Input impedance: Balanced > 10K Ohms, PIN 2 high
Output impedance: Balanced 50 Ohms nominal, PIN 2 high
Input/Output maximum signal levels: Ba18 dBV peak
Maximum output load: 600 Ohms balanced
Bypass: true power-off bypass
I/O connectors: XLR-3, 1/4" TRS
GRQ3122 and GRQ3122-S: Dual channel, one input, one output
per channel
GRQ3121, and GRQ3121-S: Single channel, one input, two
outputs. Functions on each output selectable via GRQ2 Remote
PERFORMANCE²
Frequency response: 20 Hz to 20 KHz, ±0.2 dB @ +18 dBV
THD: <0.01% at 1.0 KHz at +18 dBV with 30KHz bandwidth
SNR***: >105 dB
Dynamic Range: >110 dB
Headroom: +14 dB @ 4 dBV nominal input (balanced)
UPGRADES
Operating system firmware stored in FLASH RAM. All future
upgrades for firmware and software downloadable from Sabine
website using the Sabine Upgrade Wizard (see
Section 8.10
).
POWER
50/60 Hz available in 100 V, 120 V, 230 V; 20 W
DIMENSIONS
2-U rack mount 19 x 3.5 x 9 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)
OPERATING TEMPERATURE
Safe Operating Temperature: 0 - 50 degrees centigrade ambient
temperature (32-129F)
* Below approximately 200 Hz the feedback filters become
slightly wider to increase the feedback and rumble capture
speed at these low frequencies.
** Inputs may be balanced or unbalanced. For maximum output
capabilities, outputs must be balanced (XLR or TRS). If either
side of an output is grounded, the peak and output dynamic range
will be reduced by 6 dB.
*** Signal-to-noise ratio is the ratio of the maximum undistorted
signal by specification (26 dBV RMS sinewave) to the noise floor.
¹ Available using GRQ Remote Software only.
2
Tests performed using an Audio Precision System One model
322 or equal.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
S
ECTION
E
LEVEN
: E
NGINEERING
S
PECS
