Mark Levinson N33H owner manual 2. ~ac mains relay switch, balanced input, single-endedinput

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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.)