54
Sabine Smart Spectrum
®
Wireless
© 2011 Sabine
, Inc.
14.3.2.3. Balancing Fixed & Dynamic Filters
Each channel of your SWM 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 automati-
cally exits, after you have set enough filters to safely achieve your desired
gain level. In that case, in the factory default condition, 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
eliminate 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 technicians
can now increase their monitor or house system volume so they can hear
themselves clearly and with full fidelity, without worrying if their microphones
will suddenly squeal if they move to the wrong place.
Auditoriums and churches of all sizes will enjoy reliable feedback control. Ho-
tels and conference centers around the world can offer meeting rooms with
microphones that won’t howl during programs. The Sabine True Mobility® Wire-
less 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
Summary of Contents for SWM7000 -
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