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2. ~ac mains relay switch
The AC mains switch turns the amplifier completely off by
disconnecting the supervisory power supply from the AC
mains. Since this small supervisory supply controls the main
power supply access to AC power, shutting down the supervi-
sory power supply also disconnects the main supply from AC.
3. balanced input
Receives balanced audio input from the associated preamplifier.
One XLR connector is available.
For best performance, use balanced connections whenever
possible. Refer to the illustration below and to the associated
preamplifier documentation to ensure that Nº33H XLR input
pin assignments correspond to the associated preamplifier XLR
output pin assignments. If not, wire the cable so that the
appropriate input pin connects to the appropriate output pin.
Pin 1: Signal ground
Pin 2: Signal + (non-inverting)
Pin 3: Signal – (inverting)
Connector ground lug: chassis ground
Note
Before making balanced connections, remove the U-shaped
shorting-strap between pins 1 and 3 on the Nº33H XLR input
and save it for possible future use. This shorting-strap is
installed when the Nº33H is shipped.
4. single-ended input
Receives unbalanced audio input from a preamplifier with sin-
gle-ended outputs. These signals are converted to balanced sig-
nals upon entering the chassis and processed as balanced sig-
nals thereafter. One RCA connector is available.
If the associated preamplifier does not support balanced
connections, connect the RCA output on the preamplifier to
the RCA input on the Nº33H. To reduce the chance of noise at
the (otherwise unterminated) inverting XLR input, insert the
supplied U-shaped shorting strap between pins 1 and 3. (This
shorting strap is installed when the Nº33H is shipped.)