R-Series R275HC 2-Channel Power Amplifier User’s Manual
IMPORTANT SAFEGUARDS “WARNING” “ TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.” “CAUTION” “ TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER - SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
R275HC AMPLIFIER INTRODUCTION The Russound R275HC is a 2-channel high-current power amplifier capable of driving low impedance loads and incorporates selectable volume control protection circuitry. This amplifier can be used for power upgrades in specific zones, for large speaker selector or volume control systems and for long series-parallel speaker runs (e.g., large outdoor zones). The R275HC is rated at 75 watts per channel into 8 ohms and 100 watts into 4 ohms.
R275HC AMPLIFIER 1 8 4 2 3 5 3 4 7 6 6 Stereo/Bridge Mono Switch: Sets the pair of amplifier channels for stereo or bridge mono operation. 7 Line 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. 1 Power Switch: Turns the amplifier on/off.
R275HC AMPLIFIER BRIDGED OPERATION When the amplifier is in Bridged mode operation, both the left and right channels are combined for a higher power mono output. For bridged amplifier operation, turn off the power to the amplifier and connect an 8-ohm minimum load to the Speaker B output. Following the Bridge mode markings in red on the back of the amplifier: Connect the negative lead (-) of the speaker cable to the R+ terminal. Connect the positive lead (+) of the speaker cable to the L+ terminal.
R275HC AMPLIFIER POSSIBLE SYSTEM CONFIGURATIONS The R275HC can be configured for large autoformerbased volume control systems/speaker selectors. When using the R275HC for this application, set the Low Cut switch to the “On” position. Turning this filter “on” enables a filter that reduces the low frequency energy which protects the volume controls/speaker selectors and increases the efficiency of the system.
R275HC AMPLIFIER SPECIFICATIONS Stereo Continuous Output Power: Bridged Output Power: THD+N: 75W per channel at 8 ohms 100W per channel at 4 ohms 200W at 8 ohms, 2 channels bridged <0.05% from 20Hz to 20kHz Signal-to-Noise Ratio: >100dB A-weighted Frequency Response: 20Hz to 20KHz +/- 0.3dB Input Sensitivity: Input Impedance: Voltage Gain: 70mV for 1W at 8 ohms 610mV for 75W at 8 ohms 47kohms Line Input 32dB Power Requirements: North American Model: 120VAC 60Hz 2.
R-Series R275HC 2-Channel Power Amplifier User’s Manual 5 Forbes Rd. Newmarket, NH 03857, USA Tel 603.659.5170 • Fax 603.659.5388 e-mail: tech@russound.
