4
If your preamplifier is equipped with a balanced main output, and
particularly if long cable lengths are required between your
preamplifier and the Nº20.6, it's best to wire the Nº20.6 for balanced
operation.
For balanced operation, connect the preamplifier's main output to the
XLR-type input connector on the rear panel of the Nº20.6. The pin
assignments of this connector are:
■
Pin 1: Signal ground
■
Pin 2: Signal
+
(Non-inverting)
■
Pin 3: Signal
–
(Inverting)
■
Connector ground lug: Chassis ground
Connect the XLR-type male line-mount connector to the preamplifier's
main output cable (carefully observing pin assignments). Refer to your
preamplifier’s operating manual to verify that the pin assignments of its
output connector correspond to Figure 4. If they don't, wire the
connector so that the appropriate output pin connects to the
equivalent input pin.
Single-ended inverting
operation
If one component in the system inverts the signal and absolute phase
at the loudspeaker is desired, inverting operation should be used. In
this mode, the output signal of the amplifier will be 180
°
out of phase
with the input signal.
For inverting operation, connect the appropriate channel of the
preamplifier's main output to the inverting (
–
) input on the rear panel
of the Nº20.6. Insert a shorting RCA-type connector (available from
your Mark Levinson dealer) into the non-inverting (
+
) input on the rear
panel of the Nº20.6.
PUSH
– +
–
+
Nº20.6
–
+
Loudspeaker
From preamplifier's
main output
Shorting
plug
Balanced normal
(non-inverting) operation
Figure 3: Connections for
single-ended inverting
operation
Figure 4: Female input
connector
2
3
1