Setting up the Stereo Power Amplifier

Outputs

The following table gives details of the output connections:

Use this output

To connect to this

LEFT, RIGHT

Loudspeakers of 4Ω to 15Ω, using

 

either plug or bare wire connections.

BRIDGE MODE

A loudspeaker of 6Ω to 15Ω; see To

 

wire to an A500 Loudspeaker in bridge

 

mode, page 12.

Each channel of the 557 Stereo Power Amplifier provides twin outputs for bi-wiring. On speakers that provide separate connections to the bass/mid and tweeter units this allows the units to be connected independently to the Stereo Power Amplifier, for optimum sound quality.

Alternatively, for loudspeakers providing a single pair of inputs, either of the output terminals can be used.

Inputs

The following two alternative audio inputs are provided:

Use this input

To connect to this

LEFT INPUT,

A preamplifier, using phono connectors

RIGHT INPUT

and high-quality screened cable.

BALANCED INPUTS

A balanced analogue output, using

 

XLR connectors:

 

1

(Green)

=

GND

 

2

(Red)

=

+ve

 

3

(Black)

=

-ve

When using the balanced inputs the phono inputs should be shorted, using the two phono shorting plugs supplied.

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