SABINE GRAPHI-Q2 Specifications download pdf (Page 26)

B2-GRQ-2-OpGuide-v1-060519.pmd

SECTION EIGHT: USING GRQ2 REMOTE SOFTWARE

8.2.5.1. Setting FBX Filters with Graphi-Q Remote Software

The Remote Software offers an additional method for setting FBX filters. The new software option is

called Auto Setup Mode. See Section 6.4.1 for more information about feedback filter and terminology.

Also please read Section 6.4 for a more complete discussion of Setup Mode.

For Remote Control operation, Manual or Auto Setup Modes can only be accessed by resetting all FBX

filters in one or both channels (for two channel units). If you have a 2-channel unit, and have reset filters

in both channels, you will be asked to select the channel for setting FBX filters in Setup Mode.

NOTE: The FBX filters will not

set on single channel units if

you have the B output channel

FBX filters in bypass before

setup.

Once you are familiar with Setup

options, you may move for-

ward by clicking the appropri-

ate selection. If you are unfa-

miliar with Setup Mode opera-

tion, click Setup Help.

Using Auto Setup: Before selecting Auto Mode, make sure all your microphones are positioned, and

turned up to the approximate correct gain setting for each input, while the master gain on your mixer is

turned down. Raise the master gain slowly (only for the appropriate channel for a 2-channel system) until

you hear the first hint of feedback, then click on Auto . At this point, the Graphi-Q2 will take over, and

slowly raise its output gain, setting FBX filters sequentially as the gain increases. You will see the filters

being set in the FBX/Parametrics screen (the response curve will change and the actual frequency value

of the feedback will be displayed) and a display of the amount of gain increase. Feedback will occur at

a very low volume. Setup mode will exit, and the gain will be dropped slightly (for a safety margin), when

all fixed filters and the first dynamic FBX filter have been set, or when Setup is turned off by clicking on

the Cancel Setup button.

For two-channel systems, Auto Setup will prompt you to perform the same setup for the second channel,

or exit to normal operation. For models GRQ3121 and GRQ3121-S, Auto Setup will set the same filters

simultaneously for both A and B outputs, and will show the B output FBX/parametric screen during setup.

You cannot set FBX filters in Output A if FBX/Parametric for Output B is bypassed before setup. Set

filters first, then bypass B.

Using Manual Setup : If you select Manual Mode, the master gain must be raised manually (again,

we recommend only one channel at a time for two-channel units). Raise the gain until the system is on

the verge of feedback, then walk around the stage with a microphone until you find a position that excites

feedback. Slowly raise the gain to cause enough feedback to set an FBX filter. Repeat the process until

all of the Fixed filters and one Dynamic FBX filter are set. Then lower the gain slightly. During Manual

Setup operation, feedback will be kept to a low volume, and you will be able to see filters setting on both

the curve display, and in the FBX/Parametric screen. Manual Setup Mode will exit when either the first

dynamic FBX filter is set, or when you click on the Cancel Setup button. You’ll be prompted when Manual

Setup is exiting, and you may need to adjust system gain when Setup is releasing and no longer limiting

feedback to a lower level (setup only). Be aware of the potential for any ringing feedback to briefly rise

in volume.

8.2.5.2. Gain Structure and Manual Setup

If your power amplifier gain is low, Manual Setup Mode may not work well. The level of feedback is

compressed during Manual Setup, and the combination of compressed output and low amplifier gain may

keep feedback below its threshold. Raise the amplifier gain to correct this. This situation cannot occur

in Auto Setup Mode.

For two-channel systems, Manual Setup will allow you the choice of either performing the same setup

NOTE: Channel A & B

boxes appear only

when GRQ3122 or

GRQ3122-S models

are connected.

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SABINE GRAPHI-Q2 Specifications Page 26

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