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The “normal” leg of the Madrigal Balanced Bridging Input Adapter will be marked
with a red stripe to indicate positive polarity, and the inverted leg will be marked
with a black stripe to indicate inverted polarity (corresponding to the red and
black terminals of your loudspeaker).
The Balanced Bridging Output Adapter is simply a single, heavy gauge bus bar,
used to strap two of the output ground terminals together. This establishs a com-
mon reference for the amplifier and completes the circuit that includes the loud-
speakers.
Important! Do not attempt to operate your amplifier in a bridged mode
without first strapping the black output terminals together.
Failure to establish a common ground reference between the
two channels can damage your amplifier by forcing
significant currents to flow where they do not belong!
To bridge your Mark Levinson amplifier using a balanced input signal, follow
these steps:
1 DISCONNECT YOUR AMPLIFIER FROM EVERYTHING
Start with your amplifier totally disconnected from inputs, outputs, and AC
power. It is always best to power down an amplifier before changing con-
nections; here you are also changing its basic configuration.
2 CONNECT THE BALANCED BRIDGING INPUT ADAPTER TO THE AMP’S
INPUTS
Connect the two male XLRs to the inputs of your amplifier, noting which
XLR is marked red and which is black. You may want to standardize on
“Red is Right” to avoid confusion, although it makes no difference to the
amplifier. The channel with the red, normal input will later be connected to
the red, positive terminal of your loudspeaker.
Balanced Bridged
Input Connection