'
NOTE: While Turbo Mode is operating, the compressor LEDs may indicate compressor activity. This
is normal and will not affect compressor operation when Turbo is not engaged. When TURBO MODE
automatically turns off, you’ll be treated to a brief LED light show. The filter LEDs will light in sequence
back and forth to indicate that you are exiting TURBO MODE. Because TURBO limits the volume
of feedback as it occurs during setup, feedback volume may briefly increase when exiting TURBO. The
dancing LED display is designed to caution you to monitor your master gain setting while coming out of
TURBO.
6.3.2.3. Turbo Mode Cautions. TURBO MODE is designed to allow fast and quiet feedback elimination
during setup. TURBO should ONLY be used for pre-performance setup. DO NOT USE TURBO MODE
DURING A PERFORMANCE! This rash act will produce distorted audio and set filters on music or audio
program, not to mention premature brain blistering and the heartbreak of psoriasis.
In a very noisy environment, Turbo Mode may also prove inappropriate to use during setup. To speed
up feedback elimination, Turbo relaxes its criteria for distinguishing “good” audio from feedback and
places filters more readily. If the environment is noisy, there is a greater likelihood of placing a filter on
audio that is not feedback. When in doubt, turn Turbo off by pressing the Lock Fixed button, then press
Lock Fixed one more time (to ready the FBX Fixed filters) and raise your system gain as described in
Step Seven above. This will still eliminate feedback very quickly, though not as quickly as Turbo Mode,
and without reducing the volume of the feedback before it is filtered out. You’ll know if TURBO is on by
the LED indicator on the GRAPHI-Q front panel.
Whether or not TURBO MODE is used, the end result of setting up FBX filters should be identical. Your
sound system will have clearer, louder, feedback-free sound.
6.3.3. Adjustments Available Only with Remote Control
In addition to FBX, graphic, and high and low cut filters, your GRAPHI-Q can provide fully programmable
parametric filters. These filters are accessible only through GRQ-Remote software. Each channel of
your GRAPHI-Q can have up to 12 total filters, which can be configured as any combination of parametric,
fixed FBX, or dynamic FBX filters. See Section Eight for a complete look at GRQ-Remote Software.
6.4. COMPRESSOR/LIMITER CONTROLS
6.4.1. Front Panel Control
COMPRESSOR controls are located immediately to the right of the FBX
panel. Front panel controls consist of standard RATIO, THRESHOLD, and
GAIN makeup knobs, and two horizontal LED ladders showing channel input
gain on the top, and compressor gain reduction on the bottom row. RATIO
ranges from 1:1 to infinity: 1 (limiting); the input level THRESHOLD at which
compression is engaged can be adjusted from -30 dBV to + 30 dBV; and the
output gain of the compressor can be increased or decreased by 12 dB (this
will also serve as the control for the overall output level of the box).
Compressor KNEE, ATTACK, and RELEASE settings can only be set using
the Remote Software, and will default to the last settings programmed. (In
addition, the remote software will allow setting of a separate limiter threshold.)
The factory default settings are attack = 15 mSec, release = 400 mSec, and
knee = 20. These will remain in place until they are reprogrammed using the
software (see Section 6.7).
Section Six: Using GRAPHI-Q Controls
