Power Amplifier RB-971

A 2 x 70 watt Hi-Fi stereo power amplifier, partner to the Rotel RC-971 Stereo Control Amplifier. On the front, a press button for Power and a Power on indicator and a Bridged Mono indicator. On the back, Left and Right input RCA sockets for connection to a preamplifier. In order to use the RB-971 in bridged mode, three “jumper” connectors inside the amplifier must be moved from one set of pins to another. In bridged mode the Left and Right channels are bridged into a into a single mono amplifier and the cable from the preamplifier output is connected to the Left input RCA socket. Four terminals to connect one stereo pair of loudspeakers, or to one loudspeaker in bridged mode where the wires to the loudspeaker are connected to the positive terminals of the left and right channels.

Continuous Power Output :
70 watts per channel, min. RMS both channels driven into 8Ω
from 20Hz to 20kHz with ≤ 0.03% Total Harmonic Distortion
95 watts per channel, min. RMS both channels driven into 4Ω
from 20Hz to 20kHz with ≤ 0.05% Total Harmonic Distortion
Bridged Mono Power Output :
180 watts mono, min. RMS driven into 8Ω
from 20Hz to 20kHz with ≤ 0.1% Total Harmonic Distortion
Total Harmonic Distortion ......:  ≤ 0.03%
Intermodulation Distortion .... :  ≤ 0.03% (60Hz :7kHz, 4:1)
Damping Factor ................... :  500 (20Hz - 20kHz, 8Ω)
Speaker load impedance  .....:  4Ω minimum Stereo, 8Ω minimum bridged mode
Input Sensitivity/Impedance ..:  1.0V/33kΩ
Frequency Response ...........:  10Hz - 100kHz, ±1dB
Signal to Noise Ratio ............:  116dB (IHF, A Network)
Power Consumption .............:  250 watts

Versions/Power Requirements
115 V AC 60Hz
230 V AC 50Hz

See also the later Rotel RB-971 Mk II Power Amplifier.

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