SABINE GRAPHI-Q2 Specifications download pdf (Page 13)

SECTION SIX: USING GRAPHI-Q2 CONTROLS

Section Six: Using Graphi-Q2 Front Panel Controls

Many Graphi-Q2 owners will be immediately familiar with the simple operation of the front panel controls.

Operation of these controls will be very similar when using an RS-232 connection to control Graphi-Q2

functions from a Windows-based computer platform (see Section Eight).

Important Note on Equipment Power-on Sequencing and Feedback Suppression

The Graphi-Q2 is similar to a computer in that it requires several seconds to boot up and become

operative. Because of this, the potential exists for feedback to assault your system should you power

up all of your equipment (including the Graphi-Q2) in unison, with volumes set to operating levels.

Therefore, it is wise to consider either one of the following courses:

1. Sequence the power up so that the Graphi-Q2 turns on well ahead of the power amp. Allow

a 5 second time differential for comfort.

2. Set up the Graphi-Q2 to give the signal a boost, and adjust the rest of your gain structure

accordingly. When the Graphi-Q2 is bypassed (or still booting), the signal level will be below the

feedback threshold.

6.1. FRONT PANEL CALIBRATION

Your Sabine Graphi-Q2 ships from the factory with all front panel controls precisely calibrated for

maximum accuracy. However, if you upgrade the Graphi-Q2 (GRQ3121 or GRQ3122 only) firmware,

Sabine recommends recalibrating the front panel controls. You may also want to periodically recalibrate

to assure the highest degree of front panel control precision.

Calibration is a simple process. Set all equalizer faders to the center detent position. Rotate the Hi

Cut and Threshold knobs to the full clockwise position. Rotate the Lo Cut, Ratio, and Gain knobs

fully counterclockwise. For two channel units you must set both sets of controls.

Hold down both the Fifth Octave and Set Fixed buttons until “Calibrating Front” appears on LED

display. (For GRQ3122 use the buttons for the B channel). Release the buttons when the LED

displays “Calibration Done.”

6.2. GRAPHIC EQUALIZER CONTROLS

Please make note of the default front panel control protocols that apply when setting graphic EQ, FBX

filters, compression, delay, and output level for the two outputs of the single-input Graphi-Q2

(GRQ3121). All processing, INCLUDING delay, is applied to Output B in the factory default setting. All

processing EXCEPT delay is applied to Output A. Therefore, all graphic EQ, FBX, and compression

adjustments will apply to both outputs, while front panel delay adjustments will affect only the B output.

Remote control operation of the GRQ3121 will enable separate delay and output level control settings

for Outputs A and B. All other processing (graphic EQ, parametric EQ, and compressor/limiter settings)

can be applied to one or both outputs using software control, but the GRQ3121 will not permit unique

output settings for any processing except delay, and for the output levels.

6.2.1. Front Panel Control

The Graphi-Q2 graphic EQ sliders have a center detent, calibrated to zero boost/cut at the factory.

Raising the slider above the detent boosts a frequency band surrounding the center point nominal

frequency; lowering the slider below the detent cuts the frequency band. The Graphi-Q2 comes from

the factory set to a ±12 dB boost/cut range. You may change this to a ± 6 dB range (and back again)

by pressing and holding the delay up/down buttons simultaneously for approximately one

second. An LED in the lower right section of the front panel will indicate the 6 dB range condition when

it is illuminated. For two channel Graphi-Q2 units, pressing and holding either channel’s delay up/down

buttons will switch both channels’ EQ ranges simultaneously. It is not possible to select different ranges

for the two channels.

NOTE: Pulling down the A

channel sliders causes the B

channel to become the mas-

ter for both channels. This also

slaves the compressor, high &

low cut filters, and output gain.

Delay, bypass, and FBX con-

trols remain channel specific.

IMPORTANT

Recalibrate the

Front Panel

Controls after

Upgrading

Firmware

IMPORTANT

Equipment

Power-on

Sequencing to

Avoid Feedback

TECH TIP

Changing

Boost/Cut

range from

12 dB to 6 dB

All A-channel

Sliders down

TECH TIP

Linking Channel

A & Channel B

Using GRQ3122

Front Panel

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SABINE GRAPHI-Q2 Specifications Page 13

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