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Sabine 2.4 GHz Smart Spectrum
®
Wireless
© 2007 Sabine, Inc.
14.3.2.3. Balancing Fixed & Dynamic Filters
Each channel of your SWM7000 wireless receiver offers a total of 10
FBX filters (combined fixed and dynamic), which can be used as needed
to exterminate feedback. After years of experience and experimentation,
Sabine has settled upon a default balance of 7 fixed and 3 dynamic
filters, set at the factory. This default condition can be changed to 8 fixed
and 2 dynamic, by changing a DIP switch on the back of your receiver
(see Appendix D FBX Configuration DIP Switch), or to any configuration
using the Remote Control software (see Section 13).
If you follow setup instructions for setting FBX filters (see Section 7),
your receiver will automatically exit SETUP mode (enter READY status)
after all fixed filters, and the first dynamic filter, have set. In the default
condition, this means you will have set eight filters (seven fixed and one
dynamic), with two dynamic filters still unset and remaining on standby
alert. If you wish to set fewer filters, press the READY button before
SETUP automatically exits, after you have set enough filters to safely
achieve your desired gain level. In that case, in the factory default con-
dition, you will reserve three unset dynamic filters for standby.
14.3.3. FBX Filter Width
Sabine’s experience and testing with filters and sound quality along led us to
decide upon a default FBX filter width of .10 (one-tenth) octave as the optimal
notch width, able to eliminate feedback without affecting music programs. If,
with all filters properly set, feedback is still a problem, FBX filters may be set
to .20 (one-fifth) octave width. This wider filter setting will help to better elimi-
nate feedback trouble areas, but may also affect music programs slightly.
Therefore, the wider setting is generally considered to be appropriate where
speech (less demanding than music) is the primary application of the Sabine
Wireless system. You can globally change FBX filter width by repositioning a
rear panel DIP switch, to change from .10 to .20 octave (see Appendix D FBX
Configuration DIP Switch), or by adjusting filter width using the True MobilityTM
Remote Software (which allows a range of widths from .01 to 1.0 octave).
You may also mix filter widths, either by adjusting individual filter widths
using the Remote Software, or by changing the DIP switch position during
setup. The width of any set filter will always be determined by the position of
the switch at the time the filter is created.
14.3.4. Who Benefits from FBX?
Virtually every sound system will be improved with the Sabine True Mobility®
Wireless System. Singers and speakers who do not have sound techni-
cians can now increase their monitor or house system volume so they can
hear themselves clearly and with full fidelity, without worrying if their micro-
phones will suddenly squeal if they move to the wrong place.
Auditoriums and churches of all sizes will enjoy reliable feedback control.
Hotels and conference centers around the world can offer meeting rooms
with microphones that won’t howl during programs. The Sabine True Mobil-
ity® Wireless System can be installed in theaters, schools, sports arenas,
courtrooms, teleconferencing, intercoms or interactive remote classrooms
— anywhere one or multiple microphones are used.
FBX Theory & Practice
