Meridian Audio 557 - Manual (Page 14)

Setting up the Stereo Power Amplifier
10
Outputs
The following table gives details of the output connections:
Use this output To connect to this
LEFT, RIGHT Loudspeakers of 4
Ω
to 15
Ω
, using
either plug or bare wire connections.
BRIDGE MODE A loudspeaker of 6
Ω
to 15
Ω
; 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.