FBX is Sabine’s patented feedback control system. It seeks out and destroys feedback automatically during a performance.
There are up to 10 FBX filters per channel available in the SWM7000 FBX system. These filters are individually assignable as either an FBX Fixed, FBX Dynamic or a parametric filter.
FBX Fixed &
Dynamic Filters Introduction
There are two types of FBX filters, Fixed and Dynamic. Both operate automatically.
There is no audible difference between fixed and dynamic filters in terms of
sonic purity; the difference arises in their application.
FBX
Fixed Filters
Fixed filters are set automatically during the FBX Setup and will not change
frequency until manually reset.
FBX
Dynamic Filters
Dynamic FBX filters also set automatically, but can change frequency, on a rotating
basis, as the need arises.
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.
The default setting of 7 Fixed and 3 Dynamic can be changed to 8 Fixed and 2
Dynamic using the DIP switches on the back of your receiver, or to any configuration
using the Remote Control software.
If you follow setup instructions for setting FBX filters, 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 condition, you will
reserve three unset Dynamic filters for standby.
FBX Filter Width
Sabine’s experience and testing with filters and sound quality has 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, or by adjusting filter
width using the True Mobility® 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 FBX Parameters
button in the Tool Bar, 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.
FBX Filter Sensitivity
& Persistence
These advanced
adjustments are available only in the FBX Parameters
control window. Click the FBX Parameters
button in the Tool Bar to access
this window.