Rotel RMB-1077 Amplifier Measurements
All measurements were taken on the left channel except as noted. Measured power outputs are to the nearest Watt.
The Rotel RMB-1077's frequency response driving an 8Ω load measured -0.33dB at 10Hz, -0.10dB at 20Hz, -0.46dB at 20kHz, and +0.69dB at 50kHz.
The Rotel RMB-1077's frequency response driving a 4Ω load measured -0.36dB at 10Hz, -0.11dB at 20Hz, -0.25dB at 20kHz, and -0.73dB at 50kHz.
S/N (A-weighted, 2.83V into 8Ω 1W) from 10Hz-24kHz) measured –106.9dB. The amplifier's gain measured +27.3dB.
THD+noise at 2.83V into 8Ω (1W) measured 0.045% at 20Hz, 0.045% at 1kHz, and 0.052% at 20kHz.
THD+noise at 2.83V into 4%#937; (2W) measured 0.040% at 20Hz, 0.045% at 1kHz, and 0.047% at 20kHz.
Driving seven channels into 8Ω, the Rotel delivered 130Wpc at 20Hz and 118Wpc at 1kHz before clipping (1% THD+noise).
Into 4Ω with seven channels driven, the amp's current protection circuit kicked in before the continuous output reached the 1% THD+noise level. The output just before protection engagement was 73Wpc at 20Hz and 74Wpc at 1kHz. The Rotel's instantaneous power output with real-world program material should be closer to the results obtained with only two channels driven (below).
With just two channels driven into 8Ω, the RMB-1077 delivered 133Wpc at 1kHz at clipping (1% THD+noise). Into 4Ω, two channels driven, it delivered 257Wpc at 1% THD+ noise at 1kHz.