Crown Audio STUDIO AMPLIFIER Bridge-Monomode, Stereo Two-ChannelOperation, Bridge-MonoOperation

Studio Reference I & II Professional Studio Amplifiers

making connections, selecting sources and controlling output levels. The load you save may be your own! Crown is not responsible for damaged loads that result from carelessness or deliberate overpowering.

CAUTION: Always disconnect the AC power and turn the level controls down when making or break-

ing connections. This practice reduces the chance of loud blasts that can cause loudspeaker damage.

Studio Reference amplifiers provide three operating modes: Stereo, Bridge-Mono and Parallel-Mono. Ste- reo mode provides standard two-channel operation; Bridge-Mono provides a single channel with double the output voltage of Stereo mode; and Parallel-Mono mode provides a single channel with double the output current of Stereo mode. These modes can be selected using the stereo/mono switch on the back panel. Each mode is wired differently, so be sure to note any spe- cial wiring requirements for the mode you will be using.

3.3.1 Stereo (Two-Channel) Operation

Stereo mode installation is very intuitive: input chan- nel 1 feeds output channel 1, and input channel 2 feeds output channel 2. To put the amplifier into Stereo

mode, turn it off, slide the stereo/mono switch to the center position, and properly connect the output wiring as shown in Figure 3.5. Each output channel has two sets of binding posts to make it easier for you to con- nect multiple loudspeaker cables to each channel. Be sure to observe correct loudspeaker polarity (see Fig- ure 3.5) and be careful not to short the outputs.

CAUTION: In Stereo mode, never tie an amplifier’s outputs together directly, and never parallel them with the output of another amplifier. Such connec- tions do not result in increased output power, but may activate the protection circuitry to prevent overheating.

3.3.2 Bridge-Mono Operation

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). Wiring for Bridge-Mono mode is different from the other modes and requires special attention. First, turn off the amplifier. Then se- lect Bridge-Mono mode by sliding the stereo/mono switch to the right (as you face the back panel). Both outputs receive the channel 1 input signal, but chan- nel 2 is inverted so it can be bridged with channel 1. Do not use the channel 2 input or signal quality will be

MIXER

STUDIO REFERENCE AMPLIFIER

BRIDGE-MONO MODE

CHANNEL 1

DO NOT USE

THE CHANNEL 2

INPUTS.

CH-2

FX

PUSH PUSH

ReferenceS T U D I O

STEREO

PARALLEL BRIDGE

MONOMONO

CAUTION: TURN OFF AMPLIFIER

BEFORE CHANGING THIS SWITCH!

Fig. 3.6 Bridge-Mono Wiring

–

+

LOUDSPEAKER

CH-1

DO NOT USE

THE BLACK

BINDING

POSTS.

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