Mark Levinson 532 Owner's Manual page 13

Nº532 Power Amplifier
Note
Audio Channel Inputs
Loudspeaker Binding
Posts
Note
The audio outputs of this power amplifier are considered Class 2 (CL2)
circuits in North America. This means the wire connected between this
amplifier and the speaker(s) shall be rated at minimum Class 2 (CL2)
and shall be installed according to the U.S. National Electrical Code
(NEC) Article 725 or Canadian Electrical Code (CEC) Section 16.
One balanced and one single-ended (unbalanced) connector is
available for each audio channel input.
Single-Ended Inputs
These RCA connectors accept single-ended input from preamplifiers
with singled-ended (RCA) outputs. Single-ended input signals are
converted to balanced signals at the input stage of the amplifier,
and are handled as balanced signal thereafter.
If your preamplifier does not support balanced connection to the
power amplifier, connect the single-ended output to the RCA input
on the amplifier. To reduce the chance of noise pickup at the
(otherwise unterminated) inverting input of the XLR, insert the
provided U-shaped shorting strap between pins #1 and #3 of the
XLR connector. The shorting strap is installed at the factory.
Balanced Inputs
Accepts a signal from a preamplifier with balanced outputs via the
high quality XLR connector. Before connecting to the XLR
connector on the rear panel of the power amplifier, verify that the
shorting straps between pins #1 and #3 of the XLR input connectors
are not in place. If you need to remove the strap, be sure to save
them for future use as these straps must be in place when using the
single-ended RCA connectors to reduce noise pickup.
The pin assignments, shown on the left, of the XLR-type female
input connector are consistent with the standards adopted by the
Audio Engineering Society. Refer to the operating manual of your
preamplifier to ensure that the pin assignments of its balanced
output connectors correspond to the Mark Levinson Nº532 power
amplifier. If not, wire the cables so that the appropriate output pin
connects to the equivalent input pin.
The Nº532 has four custom-made, gold-plated, high-current
loudspeaker binding posts, two for each output channel. The
positive binding posts, labeled + (positive), are red; the negative
binding posts are black and are labeled – (negative).
Ensure when connecting the loudspeaker that at least one positive and
one negative binding post is used. There is NO ground reference.
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