Crown PIP-AMC Technical Information download pdf (Page 14)

Page 14

Com-Tech 200/400/800/1600 Power Amplifiers

140 volt distributed loudspeaker systems. If you will be

using 140 volt output, you may need to cross-refer-

ence the ratings of the step-down transformer taps

with Crown’s constant voltage computer (see Section

8.3). If you need a single channel with higher power to

drive a 70 volt line, use Parallel-Mono mode.

WARNING: Both channels must be configured for the

same output mode (8/4 ohm or 70 volt) before switch-

ing to Bridge-Mono mode.

Bridge-Mono wiring is very different from the other

modes and requires special attention. First, turn the

amplifier off. Then select Bridge-Mono mode by sliding

the dual/mono switch to the right (as you face the back

panel). Both outputs will receive the signal from chan-

nel 1 with the output of channel 2 inverted so it can be

bridged with the channel 1 output. DO NOT USE THE

CHANNEL 2 INPUT or the signal level and quality may

be greatly degraded. Also, keep the channel 2 level

control turned down completely (counterclockwise).

Note: The channel 2 input jack and level control are not

defeated in Bridge-Mono mode. A signal feeding

channel 2 will work against the channel 1 signal, and

usually results in distortion and inefficient operation.

Connect the load across the two positive (+) output ter-

channel can be used to drive a 70 volt line. Installation

is intuitive: input channel 1 feeds output channel 1,

and input channel 2 feeds output channel 2.

To put the amplifier into Dual mode, turn it off, slide the

dual/mono switch to the center position, and properly

connect the output wiring. Be sure to observe correct

loudspeaker polarity (see Figure 3.4) and be careful

not to short the two outputs.

CAUTION: Never tie an amplifier’s outputs together di-

rectly, and never parallel them with the output of an-

other amplifier. Such connections do not result in

increased output power, but may cause overheating

and premature activation of the protection circuitry.

Note: To parallel multiple amplifiers for fail-safe redun-

dancy, contact Crown’s Technical Support Group.

BRIDGE

MONO

DUAL

PARALLEL

MONO

B R I D G E - M O N O

Bridge-Mono mode is used to drive loads with a total

impedance of at least 4 ohms (see

Parallel-Mono

if the

load is less than 4 ohms). If Bridge-Mono mode and

70 volt output are used together, twice the normal out-

put voltage is produced from a single channel to drive

Use Dual 70 volt mode

for Fire Protective Sig-

naling applications (see

Section 9).

Fig. 3.5 Wiring for Dual 70 Volt Mode

COM

–

70 VOLT STEP-DOWN

TRANSFORMERS

16, 8, OR 4 OHM

70 VOLT LINE

MIXER

LOUDSPEAKERS

Com-Tech Amplifier

CHANNEL 1

CHANNEL 2

CHANNEL 1

CHANNEL 2

DUAL 70 VOLT MODE

(BOTH CHANNELS)

TURN OFF THE AMPLIFIER

BEFORE CHANGING

THE DUAL/MONO SWITCH.

TURN OFF THE AMPLIFIER

BEFORE CHANGING THE

OUTPUT MODE SWITCHES.

VOLT

8/4

OHM

8/4

OHM

CH1

CH2

BRIDGE

MONO

DUAL

PARALLEL

MONO

Programmable

Input Processor (P.I.P.)

–+

CH-2 INPUT

–+

CH-1 INPUT

PUSH TO RESET

CH-2 CH-1

910

∞

910

∞

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