Crest Audio CPX 3800 - Manual (Page 19)

p. 19
features overview
3
7 Low Cut Switch
This switch is used to activate the LOW CUT filter for the corresponding
channel. It is a push-type switch that requires a small tool to activate. The IN
position routes the input signals through the 40 Hz LOW CUT
filter, while the OUT position bypasses the filter. This filter will cut extremely
low frequencies, protecting speakers from the possibility of over-excursion.
The filter low-frequency rolloff is 12 dB per octave. The LOW CUT filter for
each channel will function independently of the crossover function.
8 Crossover Switch (100 Hz crossover)
This switch is used to activate the 100 Hz crossover for the cor-
responding channel. It is also a pushpush type switch and requires a
small tool to activate. The CPX offers two 100 Hz crossovers. These
are specially designed features that enhance the response of most
loudspeakers in a typical bi-amped application. Rather than having a flat
output curve, these crossovers use special filters to tailor the response
and provide a flat acoustical output. This type of crossover sounds more
natural than conventional state-variable crossovers. With the switch IN,
the input signals are routed through the crossover and the low frequen-
cies are automatically sent to the corresponding channel. At the same
time, the high frequencies are sent to the HIGH OUT (9) jack and must
then be patched to the INPUT of the other channel of this amplifier or
to another amplifier input to complete the bi-amped system. With the
switch OUT, the crossover is defeated and the input signal is routed
directly to the respective power amp channel. The crossover frequency
is fixed at 100 Hz and cannot be changed. The crossover configuration
is a four-pole Linkwitz-Riley approximation.
9 High Out Jacks
This 1/4” jack supplies high-frequency output signals from the activated
crossover for patching to this amplifier and/or additional power amplifier
inputs. Unlike the low-frequency crossover output that is automatically
routed to the associated channel, the high-frequency output signal must
be patched to some suitable input in order to complete the bi-amped
system. This 1/4” jack also provides an unbalanced (tip/sleeve) output to
be patched with single-conductor shielded cables.