Crown POWER-TECH 3 Instruction Manual download pdf (Page 6)

Power-Tech .1 Series Power Amplifiers

Page 6 Reference Manual

2 Installation

Always remove power from the unit and turn the level

controls off (fully counterclockwise) when making or

breaking connections. This reduces the chance of blasts

that can cause loudspeaker damage.

The guidelines below are provided to help you quickly

get your amplifier installed and ready to go. Be sure to

follow the instructions in Sections 2.1 and 2.2 for the

selected mode of operation. Additional information on

input sensitivity, load protection and required AC mains

is provided in Sections 2.3, 2.4 and 2.5.

1. Install the amplifier in an EIA standard 19-inch

(48.3-cm) rack or place it on a stable surface. Your

amplifier is 19 inches (48.3 cm) wide, 3.5 inches

(8.9 cm) tall and 16 inches (40.6 cm) deep behind

the mounting surface. IMPORTANT: Make sure

the unit has adequate ventilation.

2.1 Stereo Mode

1. Turn down the level controls (fully counterclock-

wise) and

turn off the amplifier.

2. Set the back panel stereo/mono switch to Stereo.

3. If present, remove the Parallel-Mono jumper.

4. Connect the input and output cables as shown in

the first example in Figure 2.3.

5. Turn on the amplifier and adjust the level for each

channel with the front panel controls.

CAUTION: Never parallel the two outputs by directly

tying them together, and

never parallel them with the

output of another amplifier.

2.2 Mono Modes

Your amplifier’s mono modes provide double the power

of Stereo mode in a single channel. In Bridge-Mono

mode, the outputs are wired in series for twice the output

voltage. In Parallel-Mono mode, the outputs are

paralleled for twice the current capacity.

Bridge-Mono mode is provided for loads with an

impedance greater than 4 ohms. Parallel-Mono mode

should be used with loads of 4 ohms or less.

B R I D G E - M O N O

1. Turn down the level controls (fully counterclockwise) and

turn off the amplifier.

2. Set the back panel stereo/mono switch to Bridge-Mono.

3. If installed, remove the Parallel-Mono jumper wire.

4. Connect the input and output cables as shown in the

second example in Figure 2.3. Only use the Channel 1

input.

5. Make sure the load is balanced (neither side shorted to

ground) and do not use the black (–) binding posts.

6. Turn on the amplifier and adjust the level. Only use the

Channel 1 level control.

P A R A L L E L - M O N O

CAUTION: Parallel-Mono wiring requires installation of a

jumper wire. Do not switch to Stereo or Bridge-Mono mode

until this output jumper wire is removed.

IMPORTANT: The Channel 2 IOC indicator will remain lit

when operating in Parallel-Mono mode.

1. Turn down the level controls (fully counterclockwise) and

turn off the amplifier.

2. Set the back panel stereo/mono switch to Parallel-Mono.

3. Install a solid, 14-gauge (2-mm

) or heavier jumper wire

across the two red (+) binding post outputs.

4. Connect the input and output cables following the third

example in Figure 2.3. Only use the Channel 1 input.

5. Turn on the amplifier and adjust the level. Only use the

Channel 1 level control.

Fig. 2.2 Power-Tech .1 Series Input Wiring

2. Use high-quality loudspeaker cables to connect

the load to the amplifier’s outputs. Do not use

shielded cable.

3. Use shielded cables to connect audio sources to

the amplifier inputs. Either balanced or unbal-

anced wiring and ¼-inch phone or XLR connectors

can be used as shown below. Note that unused in-

put connector pairs can be used to daisy chain an

input signal from one amplifier to another.

Fig. 2.1 Do NOT Block Air Flow

1 2 3 4 5 6 7 8 9 10 11 ... 18 19

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Crown POWER-TECH 3 Instruction Manual Page 6

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