USB 7132 / 7133 / 7134
Professional Power Amplifier
OPERATION MODES
Choosing the appropriate mode
Stereo
Special consideration when using Bridged mode
Bridged
Mode Selection
The two -position Mode Select switch (located on the rear panel) configures the amplifier for Stereo
or Bridged mode. Amplifiers are factory-configured for Stereo mode. Shut the amp off before chan-
ging modes.
Stereo
In Stereo mode, each channel operate independently, with their input attenuator controlling their
respective levels. Signal at Channel 1's input produces output at Channel 1's output, while signal at
Channel 2's input produces output at Channel 2's output. Recommended minimum nominal load
impedance for stereo operation is 2 Ohms per channel.
Bridged
Bridged mode straps both amplifier channels together to make a single channel monaural amplifier.
One channel pushes and the other pulls equally, increasing the power output over that of either
channel alone (see Specifications). Channel 1 s attenuator is used to control signal level.
Use extreme caution when operating the amplifier in Bridged mode .Never ground either side of the
speaker cable when the amplifier is in Bridged mode; both sides are hot.
If an output patch panel is used, all connections must be isolated from each other and from the
panel .The recommended minimum nominal load impedance in the Bridged mode is 4 ohms, which
is the equivalent to driving both channels separately at 2 ohms.
When the amplifier channel is operated in Bridge mode, the power available doubles allowing larger
speakers to be driven. Two things must be kept in mind when bridge mode is used, namely the
minimum impedance that can be driven up to 4 ohms and if binding post outputs are used, the
speaker wiring must be changed according to this manual. See connections.
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