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Setting up the Stereo Power Amplifier
12
To wire to an A500 Loudspeaker in
bridge mode
557 Stereo Power Amplifier
A500 Loudspeaker
ON
Input
You can use the 557 as a mono power amplifier, to obtain more
than three times the power output, by wiring it in bridge mode.
● Switch the BRIDGE MODE switch to the ON position.
● Connect the audio input to only the LEFT INPUT or LEFT
BALANCED INPUT.
● Connect the loudspeaker between the red LEFT and RIGHT
terminals, leaving the black terminals unconnected.
To bi-wire to A500 Loudspeakers
557 Stereo Power Amplifier
A500 LoudspeakerA500 Loudspeaker
● Set the BRIDGE MODE switch to the OFF position.
● If necessary, remove the links bridging the LF and HF
terminals on the back of each loudspeaker.
● Connect the LF red and black terminals from each
loudspeaker to the red and black terminals on the appropriate
channel of the Stereo Power Amplifier, using twin loudspeaker
cable.
● Connect the HF red and black terminals from each
loudspeaker to the other pair of red and black terminals on
the appropriate channel of the Stereo Power Amplifier.