Crown PIP-AMC Technical Information download pdf (Page 13)

Page 13

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

this, the input sensitivity should be set to 0.775 volts for

70 volt output (see Section 4.4). Again, you must al-

ways configure both channels the same when using

Bridge-Mono or Parallel-Mono modes.

Because of the way

Com-Tech

amplifiers are de-

signed, they can actually be used to directly drive con-

stant voltage lines in 8/4 ohm mode. Being able to use

lower constant voltage levels can be very convenient if

building codes or other obstacles do not permit higher

constant voltage levels. When 8/4 ohm mode is used

to drive a distributed loudspeaker system, the constant

voltage output varies with the output power rating of

the amplifier. With 8/4 ohm output in Dual or Parallel-

Mono mode, the

Com-Tech 200

can drive a 25 volt

line, the

Com-Tech 400

can drive a 35 volt line, the

Com-Tech 800

can drive a 50 volt line, and the

Com-Tech 1600

can drive a 70 volt line. Using Bridge-

Mono mode, these voltage levels are doubled for a

single channel. Again, to effectively use different con-

stant voltage levels, you may need to cross-reference

the ratings for the step-down transformers’ taps using

Crown’s constant voltage computer (see Section 8.3).

BRIDGE

MONO

DUAL

PARALLEL

MONO

D U A L

Dual mode lets each amplifier channel work indepen-

dently like a “dual mono” or stereo amplifier. And if you

select both Dual mode and 70 volt output, each output

WARNING: The output mode switches must be set the

same (8/4 ohm or 70 volt mode) when operating in

Bridge-Mono or Parallel-Mono mode.

When connecting a 70 volt step-down transformer, do

not exceed its power rating. Too much power can

saturate a transformer and cause it to appear as a

short circuit to the amplifier. If this happens, no dam-

age should occur, but the amplifier may run less effi-

ciently.

VOLT

8/4

OHM

8 / 4 O H M

8/4 ohm mode is commonly used to drive loudspeak-

ers with impedances from 2 to 16 ohms. When using

this output mode, appropriate load impedances will

depend on the dual/mono mode that you select. The

available dual/mono modes (Dual, Bridge-Mono and

Parallel-Mono) will be described in sections that follow.

Configuring your amplifier for 8/4 ohm mode is

straightforward. Turn off the amplifier, then slide the

output mode switches to the left (as you face the back

panel).

When the amplifier is set up for two-channel (Dual

mode) operation, it is possible to configure one output

channel for 8/4 ohm operation and the other for 70 volt

operation. If you plan to use different output modes like

Fig. 3.4 Wiring for Dual 8/4 Ohm Mode

MIXER

LOUDSPEAKERS

Com-Tech Amplifier

–

CHANNEL 1

CHANNEL 2

CHANNEL 1

CHANNEL 2

DUAL 8/4 OHM MODE

(BOTH CHANNELS)

TURN OFF THE AMP LIFIER

BEFORE CHANGING

THE DUAL/MONO SWITCH.

VOLT

8/4

OHM

8/4

OHM

CH1

CH2

TURN OFF THE AMPLIFIER

BEFORE CHANGING THE

OUTPUT MODE SWITCHES.

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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