Specifications

Page 7
D-45 / D-75A Power Amplifiers
loudspeakers, you can use bridge-mono mode without
actually bridging the outputs. Bridge-mono mode is like
dual mode except the channel 1 input feeds both out-
puts, 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.
Input Wiring Tips