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Reference Manual
Reference Manual
CE 4000
The amp with an Attitude!
CE 4000
The amp with an Attitude!
On the other hand, an unbalanced circuit usually holds one
leg at ground potential, while the second leg is “hot.” Unbal-
anced line is less expensive, but is much more susceptible to
noise, and is not usually used in professional applications. For
the cleanest signal, without unwanted hum and buzz, bal-
anced line is always recommended. It is especially helpful if
you have a long cable run (over 10 feet (3 m)), since noise is
easily introduced into long, unbalanced lines.
–
+
3
1
2
GND
FROM
SOURCE
INPUT
BALANCED
+
–
SHIELD
FROM
SOURCE
INPUT
UNBALANCED
+
SHIELD
+
3
1
2
SHIELD
4 Crown Pro Information Guides
Balancing the Line
A balanced audio circuit typically will have both positive (+)
and negative (–) legs of the circuit isolated from the ground
circuit. These balanced legs exhibit identical impedance char-
acteristics with respect to ground, and may also carry the au-
dio signal at the same level, but with opposite polarities. This
results in a line that offers excellent rejection of unwanted noise.
Fig. 4.1
Balanced &
Unbalanced
Input Wiring
Fig. 4.2
Polarity
Conversions
Mode Switch:
This two-position switch, located on the back
panel, allows the selection of either Stereo or Bridge-Mono
mode of operation.
Stereo mode provides identical power output to each of the
two amplifier output channels. Bridge-Mono Mode combines
the two amplifier output channels into a single mono channel
with twice the voltage of a single stereo channel. This means
the output will be much more powerful! It does this by bridging
the outputs, and it requires special output wiring.
Do NOT se-
lect Bridge-Mono mode without first making sure the am-
plifier has been wired in a Bridge-Mono configuration.
For
more information on wiring for Bridge-Mono mode, see the In-
stallation section of this manual
, or consult your system in-
staller.
When Bridge-Mono Mode is selected, only the Channel 1 Level
control and the Channel 1 Signal LED will work. If the Channel
2 input is wired, the Channel 2 Level control should be turned
to “
¥
”
ÿ
(counter/anti-clockwise) to prevent distortion.
CH1 and CH2 Filter Switches
:
A three-position low-pass
and a four-position high-pass filter switch for each channel
are located on the back panel below the input and output
modules. Low-pass filter is switchable among settings for
Flat, 80 Hz and 100 Hz, with a 24-dB per octave rolloff. High-
pass filter is switchable among settings for Flat, 30 Hz, 40
Hz, and 50 Hz, with an 18-dB per octave rolloff.
Fault Jack:
This RJ11 jack (which looks like a phone jack) is
located on the back panel. By attaching a signalling device to
the Fault jack, you can monitor the amplifier’s Fault status from
a remote location. See the Advanced Features and Options
section of this manual
for more information on fault monitoring
and suggestions for signalling device circuitry.
1/4 inch
XLR
(6.35 mm)
Tip
=
+
=
Pin 2
Ring
=
–
=
Pin 3
Sleeve
=
=
Pin 1
Refer to Figure 4.2 for proper pin assignments for both ¼ inch
(6.35-mm) and 3-pin XLR balanced audio wiring.
