%
•
TURBO MODE refers to Sabine’s unique, exceptionally fast method of placing FBX filters during
sound system setup. TURBO MODE is less “fussy” about analyzing the sound it hears and is more
likely to regard audio signals over a minimum threshold as feedback. It’s also designed to allow feedback
to occur at lower input levels, and, finally, it imposes a strong limiter on the feedback output as it occurs.
The net result of all this black magic is that you are able to ring out feedback more quickly, and at a much
quieter level! You’ll know TURBO MODE is engaged when the Turbo LED (at the right of the front panel)
is illuminated.
MAKE SURE TURBO MODE IS OFF WHEN YOU USE THE GRAPHI-Q OR YOUR AUDIO SIGNAL QUALITY MAY SUFFER!
(See Section 6.3.2.3 Turbo Mode Cautions).
6.3.2. Front Panel Control of FBX filters
Note: Most of the front panel and GRQ-Remote control operation of the FBX section of the GRAPHI-
Q is similar, except that the remote control replaces your fingers with a mouse. In addition, there are
some controls offered only with GRQ-Remote software. These features are summarized in Section
Eight.
Controls for the patented FBX Feedback Exterminator are located immediately to the right of the HIGH
and LOW CUT FILTERS.
6.3.2.1. FBX Filter LED Indicators. The 12 LEDs on the front panel
GRAPHI-Q correspond to 12 available FBX filters. Each time an FBX filter
sets, another LED will light. A blinking LED indicates which filter was most
recently set or made deeper (a filter may start at one depth and notch deeper
at the same frequency as the system gain increases). The GRAPHI-Q
comes preset from the factory to a default setting of nine Fixed and three
Dynamic filters. However, you may follow the instructions in STEP 5 below
to reconfigure the setup to be any combination of Fixed and Dynamic filters.
6.3.2.2. Eliminating Feedback with the GRAPHI-Q FBX Filters. Follow
these steps to obtain the maximum gain before feedback, with minimal or no
loss in the tonal quality of your program. The steps that follow are applicable
to setting up a one-channel unit (GRQ-3101). When using the GRQ-3102, we
recommend setting up one channel at a time by turning down the other
channel of the power amplifier. If you are using both outputs of your GRQ-
3101, you may wish to turn down the power amp gain for whichever output
is less likely to produce feedback. If both channels are equally feedback
prone, leave the power amps turned up. This will allow you to set filters that
are specific to each channel of your sound system.
STEP ONE: EQUIPMENT SETUP.
Set up your sound system and position all the speakers and microphones you anticipate using. When
possible, avoid placing microphones directly in front of speakers.
STEP TWO: TURN OFF NOISE GATES.
If there is any equipment in the signal path that incorporates a noise gate function, you MUST
DISENGAGE these noise gates prior to the setup procedure. You may reengage them upon setup
conclusion.
STEP THREE: GAIN DOWN, TURN ON.
Set the master volumes on your mixer to their lowest gain positions. Turn on the mixer, then the GRAPHI-
Q, then any other accessories, and finally your power amplifier. Adjust the gain settings and balance
for all your microphones, but keep your master mixer volume down.
STEP FOUR: RESET FILTERS.
If there are FBX filters already set (indicated by illuminated LEDs), you should RESET these filters.
(NOTE: For maximum FBX power, we recommend resetting filters every time you change or move your
sound system.)
Section Six: Using GRAPHI-Q Controls
