Rotel RSP-1570 Surround Processor and RMB-1575 Amplifier HT Labs Measures Rotel RSP-1570 Surround Processor

HT Labs Measures Rotel RSP-1570 Surround Processor

Analog frequency response in Bypass mode:
–0.25 dB at 10 Hz
–0.07 dB at 20 Hz
–0.09 dB at 20 kHz
–0.57 dB at 50 kHz

Analog frequency response with signal processing:
–0.47 dB at 10 Hz
–0.14 dB at 20 Hz
–0.16 dB at 20 kHz
–46.90 dB at 50 kHz

This chart shows the frequency response of the left (aqua), center (green), LFE (purple), and left surround (red) channels at the preamp outputs of the Dolby Digital decoder. The left channel measures –0.06 decibels at 20 hertz and –0.18 dB at 20 kilohertz. The center channel measures –0.06 dB at 20 Hz and –0.18 dB at 20 kHz, and the left surround channel measures –0.06 dB at 20 Hz and –0.18 dB at 20 kHz. The LFE channel, normalized to the level at 40 Hz, is +0.04 dB at 20 Hz, reaches the upper –3-dB point at 110 Hz, and reaches the upper –6-dB point at 118 Hz.

Response from the multichannel input to the main output measures –0.23 dB at 10 Hz, –0.06 dB at 20 Hz, –0.09 dB at 20 kHz, and –0.58 dB at 50 kHz. The analog THD+N is less than 0.015 percent at 1 kHz with a 100-millivolt input and the volume control set to 86. Crosstalk with a 100-mV input was –79.08 dB left to right and –79.20 dB right to left. The signal-to-noise ratio with “A” weighting was –125.27 dBrA.—MJP

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