Studio Reference I & II Professional Studio Amplifiers

greatly degraded. Also, turn down the channel 2 level

is very different from the other modes and requires

control (fully counterclockwise).

special attention.

Note: The channel 2 input and level control are not de-

To select Parallel-Mono mode, turn off the amplifier and

feated in Bridge-Mono mode. Any signal feeding chan-

slide the stereo/mono switch to the left (as you face the

nel 2 will work against the channel 1 signal, and usually

back panel). Connect the input signal to channel 1 only.

results in distortion and inefficient operation.

The channel 2 input and level control are bypassed in

Connect the load across the two red (+) binding posts

this mode, so they should not be used.

 

(see Figure 3.6). The positive (+) loudspeaker lead

Note: It is normal for the channel 2 IOC indicator to stay

connects to the red channel 1 binding post, and the

on in Parallel-Mono mode.

negative (–) or ground lead from the loudspeaker con-

Connect the load to the channel 1 output as shown in

nects to the red channel 2 binding post. Do not con-

nect the black binding posts (–). Also, the load must be

Figure 3.7. The positive (+) lead from the loudspeaker

balanced (neither side shorted to ground).

connects to the red channel 1 binding post, and the

CAUTION: Only connect balanced equipment

negative (–) or ground lead from the loudspeaker con-

nects to the black channel 1 binding post. Finally, in-

(meters, switches, etc.) to the Bridge-Mono output.

stall a jumper wire of at least 14 gauge between the

Both sides of the line must be isolated from the in-

channel 1 and channel 2 red binding posts.

put grounds or oscillations may occur.

CAUTION: When Parallel-Mono wiring is installed,

3.3.3 Parallel-Mono Operation

do not attempt to operate in Stereo or Bridge-Mono

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

mode until the wiring is removed (especially the

impedance of less than 4 ohms (see Bridge-Mono if the

jumper wire). Failure to do so will result in high dis-

load is 4 ohms or more). Wiring for Parallel-Mono mode

tortion and excessive heating.

MIXER

STUDIO REFERENCE AMPLIFIER

PARALLEL-MONO MODE

CHANNEL 1

 

 

 

ADD A 14 GAUGE

 

 

OR LARGER

 

 

JUMPER BETWEEN

 

THE CHANNEL 2

THE CHANNEL 1

 

INPUTS ARE

AND 2 RED (+)

 

NOT USED

BINDING POSTS

 

 

CH-2

CH-1

FX

PUSH

PUSH

ReferenceS T U D I O

STEREO

PARALLEL BRIDGE

MONOMONO

CAUTION: TURN OFF AMPLIFIER

BEFORE CHANGING THIS SWITCH!

Fig. 3.7 Parallel-Mono Wiring

+

LOUDSPEAKER

Page 13

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Image 13
Crown Audio STUDIO AMPLIFIER Meters, switches, etc. to the Bridge-Mono output, Mode until the wiring is removed especially

STUDIO AMPLIFIER specifications

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