BSS Audio FCS-966 Owner's Manual - Manual (Page 24)

Like the LF contour
control, HF contour should
be regarded as a way of
musically changing the
tonal balance of the FCS
966.
A common problem
encountered in live sound applications is the drop in treble level that occurs
when an audience is present. Heat and humidity can also alter the level of
treble during a performance. Advancing the HF contour control is a unique
and ideal way of dealing with this effect.
Sometimes during a performance the complete opposite occurs, namely
an excess of high frequencies. This is caused by the performers becoming
more exuberant as the evening progresses. If left unchecked, this higher
than expected level can easily cause distortion and listener fatigue. Without
disturbing the main equalizer section, reducing the level of the HF contour
allows subtle control of this phenomenon.
As the contour controls are
gentle in operation, they
are intended to be used
whenever it is desired to
change the tonal balance
of the sound without
disturbing the main
equalizer settings.
The LF contour control
has many uses, but one particular application concerns small PA systems and
presentations that contain both pre-recorded material and live presentations.
It is often necessary to use slightly different amounts of bass for each type of
program to avoid, for example, the presenter sounding particularly boomy, or
the pre-recorded material sounding flat. The single contour control is ideal for
this.
On larger systems it may become necessary to slightly alter the weight of
the bass content to correct for differences between the sound check and the
actual live performance. Under these circumstances, great care will usually
have been exercised setting up the main equalizer section during rehearsals to
compensate for room acoustics etc. and it is highly undesirable to alter these.
Adjusting the LF contour control provides a simple solution.
Using the HF Filter in conjunction with LF contour provides a very powerful
combination for adding 'weight' to small systems without causing sub-sonic
overloads.
Application examples
8.5 Uses for the LF
contour
8.6 Use for the HF
contour