Ashly Protea 4.8SP Betriebshandbuch - Seite 6
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Operating Manual - PROTEA 4.8SP and 3.6SP System Processors
4.6 Audio Functions
4.6a Gain
Input and Output Gain are
separately adjustable from -40dB to
+12dB in 0.1dB increments.
The output gain menu also
provides for selection of input source(s)
for a given output channel, as well as
polarity of the outgoing signal. Any in-
put or combination of inputs can be
routed to any or all outputs. Keep
mind that two signals which share sig-
nificant content, such as a stereo source, will be up to 6dB louder when combined.
4.6b EQ
The Protea SP EQ section of-
fers full parametric EQ as well as 1st
and 2nd order shelving filters on in-
puts and outputs. Each input channel
has six selectable EQ filters, while
each output channel has four select-
able EQ filters. In all cases, each filter
is selectable between parametric
(PEQ), 1st order Low Shelf (LS1), 2nd
order Low Shelf (LS2), 1st order High
Shelf (HS1), and 2nd order High Shelf
(HS2).
Shelving EQ filters: 1st or-
der filters use a gentle 6dB per octave slope,
while 2nd order filters use a 12dB per octave
slope for more a pronounced boost or cut. All
shelving filters have a boost/cut range of +/-
15dB. Low shelving filters have a frequency
range from 19.7Hz through 2kHz, and the high
shelving filters range from 3.886kHz through
21.9kHz. Shelving filters are most useful as
broad tone controls to boost or cut the high
end or low end of an audio signal's frequency
content. Because they affect a wider spec-
trum of audio, they are not as suitable for feed-
back control as parametric filters.
Parametric EQ (PEQ) uses peak fil-
ters with the ability to control boost or cut,
frequency center, and bandwidth. Think of
one band of parametric EQ as a single graphic equalizer fader except that the frequency is variable, not fixed, and that
the bandwidth, or how "wide" the filter affects the frequency spectrum at the center frequency, is completely variable.
The smaller the bandwidth, the less the audio signal on either side of the frequency center is boost or cut, whereas a larger
"wider" bandwidth produces an audible change to the overall tone of a signal. Parametric filters are best used to hunt
6
GAIN A
GAIN 1
in
+20dB
+10dB
0dB
-10dB
-20dB
-30dB
20Hz
0.0dB
Source:A
0.0dB
Pol:Normal
EQ 1
Filtr:1-PEQ
0.0dB
1000Hz 1.00o
1st Order Filter
2nd Order Filter
Low Shelf
200Hz
4.8SP and 3.6SP Shelving Filters
High Shelf
2KHz
20KHz