Power-Tech 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
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
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
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
2
) 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.
CAUTION: With Parallel-Mono wiring, do not switch to
Stereo or Bridge-Mono mode until the output jumper wire
is removed.
IMPORTANT: The Channel 2
IOC indicator will remain lit
when operating in Parallel-Mono mode.
Fig. 2.2 Power-Tech 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 can be used as shown below. (XLR
connectors are available with the MT-XLR acces-
sory, see Section 5.)
Fig. 2.1 Do NOT Block Air Flow
