Bridge Mode - Peavey CA-A540B Operating Manual

quickly. In all circumstances, an investigation should be undertaken to determine the cause of the
thermal shut down. If the amplifier is not severely overloaded or its outputs shorted, and air flow is
normal in and out of the amplifier, steps should be taken to provide a cooler environment for the
amplifier, along with any other amplifiers in the same equipment cabinet. As a general rule, the
cooler electronic equipment is operated, the longer its useful service life.

BRIDGE MODE

BRIDGE MODE is not recommended in installations where the amplifier is located at a distance
from the speaker system. The CA-A540 and CA-A800 amplifiers are equipped with switching to
enable BRIDGE operation, should the installation require it. BRIDGE MODE operation is
accomplished by placing the mode switch in the ÒBRIDGEÓ position, connecting the load across Ò+Ó
terminal of Channel ÒAÓ for the positive and the Ò+Ó terminal of Channel ÒBÓ for the negative. Use
Channel ÒAÓ as the input channel. The Channel ÒBÓ input is defeated in this mode. In BRIDGE
MODE, the minimum recommended load impedance is 8 ohms.
SPS OPERATION
PeaveyÕs patented SPS compression system maximizes the performance of the amplifier by
preventing the power amplifier from clipping under maximum power delivery conditions. This
compression system is activated by a very unique circuit that senses signal conditions which might
overload the amplifier, reducing the amp gain when clipping is imminent. The threshold of
compression is near the clip point, so no active compression occurs within the normal dynamic
range of the audio signal. By preventing clipping, this feature reduces the possibility of system
distortion and possible damage to the loudspeaker. In normal theater applications, it is
recommended that the SPS compression feature is placed in ENABLE.
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