Crown D-45, Reference Manual

Page: 7 / 18

Page 7
D-45 / D-75A Power Amplifiers
IMPORTANT:
IN MONO MODE USE
THE CH-1 INPUT ONLY.
3
1 2 GND
+
–
TIP
RING
SLEEVE GND
XLR WIRING
PHONE WIRING
REMPLACER
SEULMENT
REPLACE ONLY WITH
3AG–2A 125/250V
PUSH PUSH
+
CH-2 CH-1 INPUTS
OUTPUTS
CH-2 CH-1
+
IMPORTANT:
IN MONO MODE USE
THE CH-1 INPUT ONLY.
3
1 2
GND
+
–
TIP
RING
SLEEVE GND
XLR WIRING
PHONE WIRING
REMPLACER
SEULMENT
REPLACE ONLY WITH
3AG–2A 125/250V
PUSH PUSH
+
CH-2 CH-1 INPUTS
OUTPUTS
CH-2 CH-1
+
CHANNEL 2 CHANNEL 1
CHANNEL 1
–
+
CHANNEL 1
LOUDSPEAKER
–
+
CHANNEL 2
LOUDSPEAKER
DUAL MODE
BRIDGE-MONO MODE
FROM THE FACTORY, YOUR AMPLIFIER
IS CONFIGURED FOR DUAL OPERATION
TO CHANGE THE DUAL/MONO
MODE, REFER TO APPENDIX A
+
–
MIXER
DO NOT
USE
DO NOT
USE
CONNECT THE LOAD ACROSS THE POSITIVE (+)
OUTPUT TERMINALS. FOR PROPER POLARITY,
CONNECT THE CHANNEL 1 OUTPUT TO THE
POSITIVE (+) LOUDSPEAKER LEAD.
MIXER
D-75A / D-45 AMPLIFIER
D-75A / D-45 AMPLIFIER
loudspeakers, you can use bridge-mono mode with-
out actually bridging the outputs. Bridge-mono mode
is like dual mode except the channel 1 input feeds both
outputs, and the channel 2 output is inverted. To use
bridge-mono mode without bridging the outputs, wire
your loudspeakers as you would for dual mode, but
invert the polarity of the channel 2 output wiring (posi-
tive goes to negative, and negative goes to positive).
2.3.2 Input Connection
The balanced combination XLR/phone inputs have a
typical impedance of 20 K ohms. With unbalanced wir-
ing, input impedance is typically 10 K ohms. The line
level output from most devices is sufficient to drive the
inputs. The XLR connectors are wired with pin 1 as
ground, pin 2 as positive (+) and pin 3 as negative (–);
the phone connectors are wired with tip as positive (+),
ring as negative (–) and sleeve as ground. Be sure to
use shielded cables with unbalanced sources.
CAUTION: Never connect input and output grounds
together.
Fig. 2.2 System Connection
1. Use only shielded cable.
2. Avoid unbalanced lines longer than
10 feet (3 meters).
3. Keep signal and power wiring apart.
4. Turn off the unit before making connec-
tions. Crown is not liable for injury or
damage due to overdriven components.
–
+
3
1
2
GND
FROM
SOURCE
INPUT
BALANCED
+
–
SHIELD
FROM
SOURCE
INPUT
UNBALANCED
+
SHIELD
+
3
1
2
SHIELD
Input Wiring Tips