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Operating Manual - PROTEA SYSTEM II 4.24C Crossover / System Processor
6
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 sig-
nal. Input signal sources are A, B, C,
D, A+B, C+D, all four inputs com-
bined, or no input (Off). Keep in mind
that two signals which share significant
content, such as a stereo source, will
be up to 6dB louder when combined.
4.6b EQ
The Protea 4.24C EQ section
offers full parametric EQ as well as
1st and 2nd order shelving filters on
inputs and outputs. Each input chan-
nel has six selectable EQ filters, while
each output channel has four select-
able EQ filters. In all cases, each fil-
ter 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 order fil-
ters 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 spectrum of audio, they are not as suit-
able for feedback control as parametric fil-
ters.
In
p
ut Gain
Channel A-D
Level
-40 to +12
Input Gain LCD Displa
y
GAIN A
0.0dB
Output Gain LCD Displa
y
Output Gain
Channel 1-8
Level
-40 to +20
Signal Source
A+B,C+D,All
Output
Polarity
A,B,C,D
GAIN 1
0.0dB
Source:A
Pol:Normal
200Hz 2KHz 20KHz20Hz
0dB
-10dB
-20dB
+10dB
+20dB
-30dB
Low Shelf Hi
g
h Shelf
4.24C Shelving Filters
2nd Order Filter
1st Order Filter
Ch. A-D EQ
Ch. 1-8 EQ
EQ +/-
Level
EQ LCD Displa
y
Parametric
High Shelf-2nd
Parametric
Bandwidth
Low Shelf-1st
PEQ, LS, HS
Frequency
6 In
p
ut Fltrs
4 Out
p
t Fltrs
Low Shelf-2nd
High Shelf-1st
EQ 1
0.0dB
Filtr:1-PEQ
1000Hz 1.00o