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Operating Manual - PROTEA SYSTEM II 3.24CL Crossover / System Processor

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 pro-

vides for selection of input source(s)

for a given output channel, as well as

polarity of the outgoing signal. Input

signal sources are A, B, C, A+B, all three

inputs combined, or no input (Off).

Keep in mind that two signals which

share significant content, such as a ste-

reo source, will be up to 6dB louder

when combined.

4.6b EQ

The Protea 3.24CL EQ section

offers 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 selectable EQ

filters. In all cases, each filter is se-

lectable 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 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 spectrum of au-

dio, they are not as suitable for feedback con-

trol as parametric filters.

Low Shelf

+20dB

+10dB

0dB

-10dB

-20dB

-30dB

20Hz

200Hz

3.24CL Shelving Filters

1st Order Filter

2nd Order Filter

High Shelf

2KHz

20KHz