R275HC Amplifier

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1Power Switch: Turns the amplifier on/off. This switch does not disconnect the main power feed from the amplifier; this requires that the power cord be unplugged from the outlet.

2Low Cut (High Pass) Switch: Enables/disables the filter that reduces very low frequency energy and protects autoformer-based volume control/speaker selectors. When “on,” the filter is set to -3dB at 40 Hz. When off, the frequency response is flat from 20Hz to 20kHz.

3Gain Controls: Left and Right gain controls inde- pendently adjust the sound level for each channel. When used in the bridged mode only the Left control is used.

4Loop Output: The loop output is a passive passthrough of the line input. These jacks can be used to daisy chain the input signal to another amplifier in the system.

5Speaker A/B Outputs: The A and B speaker out- puts are in parallel to the amplifier output. The mini- mum load in stereo mode is 4 ohms. This can be used to drive up to 2 pairs of 8-ohm speakers or 1 pair of 4-ohm speakers. The minimum load imped- ance for bridged mode operation is 8 ohms, Speaker B only.

6Stereo/Bridge Mono Switch: Sets the pair of amplifier channels for stereo or bridge mono opera- tion.

7Line Input: The line audio input is a sensing input that will activate the amplifier when an audio signal from a source is present. When there is no audio the zone will go into standby. The Left input is used for bridged mono operation only.

8AC Input: The AC voltage input for the North American model is 120VAC at 60Hz (for the European model, 230VAC at 50Hz). This receptacle accepts a 3-prong IEC 320 type connector. A detachable 3-terminal power cord is included.