SABINE FBX-SOLO SL820 - Manual (Page 10)

10
BEFORE YOU BEGIN...
The FBX automatic feedback controller improves any
sound reinforcement system. By following these
simple instructions, you will be assured of the most
benefit from your FBX and sound system. The in-
structions presume that you are familiar with the
fundamentals of sound reinforcement. If any of the
terms are not clear, or if the system does not perform
as expected, contact your local Sabine dealer for
further information. Read on for a basic explanation of
FBX features you should understand before using
your FBX.
POWERING UP
When connecting the
power supply to the FBX-
SOLO, angle the con-
nector down, then push
the connector up into the input gently, with the lip
facing up as shown. Do not force the connector into
or out of the FBX.
UNDERSTANDING FIXED & DYNAMIC FILTERS
The FBX has two types of constant “Q” filters: Fixed
and Dynamic. Both filters are placed the same way:
feedback is detected and the filter is placed just deep
enough to eliminate it. The difference between Fixed
and Dynamic comes after the filter is placed.
Fixed filters are set automatically during the initial
setup and remain on the initially detected feedback
frequency — they do not move. The system’s gain
before feedback is provided by the Fixed filters; i.e.,
increasing the number of Fixed filters increases the
system’s allowable gain before feedback. The FBX’s
Dynamic filters control intermittent feedback that
occurs during the program.
NOTE: Dynamic filters release only when neces-
sary, i.e., after all filters have set, and a new
feedback frequency has been detected. These
filters will not "gradually release" as they might in
other feedback controllers — leaving you unpro-
tected and at risk of feedback. Sabine's Dynamic
filters allow for adaptive, safe, continuous feed-
back control during the performance.
If Lock Fixed is not engaged, the Fixed filters will
control feedback during performance on their as-
signed frequencies (configured during setup). In-