Owner`s manual

17
LOG
MAGNITUDE
(dB)
FREQUENCY
50
-18
-12
-6
0
6
100 300 1000 3000 10000 22050
HS
HIGH SHELF FILTER
Frequency: 1,000 Hz
Gain: +12 dB
Bandwidth: N/A
LOG
MAGNITUDE
(dB)
FREQUENCY
50
-6
0
6
12
18
100 300 1000 3000 10000 22050
LS
LOW SHELF FILTER
Frequency: 1,000 Hz
Gain: +12 dB
Bandwidth: N/A
Shelving Filters
Shelving filters are used primarily as “tone controls,” cutting or boosting
whole regions of the spectrum. (You can think of them as fancy versions of
the traditional “Bass” and “Treble” controls you’d find on home stereos or
boom boxes.) A high shelf filter, for instance, acts by raising or lowering
the part of the spectrum above the cut-off frequency.
The graphs below show the response of the high shelf and low shelf filters
at +12dB gain. Notice that the slope of the roll-off is 6dB per octave. The
AVP’s shelf filters provide a slope control that let’s you vary the filter’s
slope between 2dB and 12dB per octave.