AV Receiver Reviews

Two channels driven continuously into 8-ohm loads:
0.1% distortion at 174.1 watts
1% distortion at 198.3 watts

Five channels driven continuously into 8-ohm loads:
0.1% distortion at 127.0 watts
1% distortion at 159.9 watts

Seven channels driven continuously into 8-ohm loads:
0.1% distortion at 116.6 watts
1% distortion at 137.5 watts

Analog frequency response in Bypass mode:
–0.22 dB at 10 Hz
–0.06 dB at 20 Hz
–0.05 dB at 20 kHz
–0.13 dB at 50 kHz

Analog frequency response with signal processing:
–4.02 dB at 10 Hz
–1.27 dB at 20 Hz
–0.21 dB at 20 kHz
–61.73 dB at 50 kHz

This graph shows that the RAP-1580’s left channel, from CD input to speaker output with two channels driving 8-ohm loads, reaches 0.1% distortion at 174.1 watts and 1% distortion at 198.3 watts. Into 4 ohms, the amplifier reaches 0.1% distortion at 232.8 watts and 1% distortion at 278.2 watts.

Response from the multichannel input to the speaker output measures –0.22 dB at 10 Hz, –0.06 dB at 20 Hz, –0.03 dB at 20 kHz, and –0.12 dB at 50 kHz. THD+N from the CD input to the speaker output was less than 0.015% at 1 kHz when driving 2.83 volts into an 8-ohm load. Crosstalk at 1 kHz driving 2.83 volts into an 8-ohm load was –86.10 dB left to right and –86.03 dB right to left. The signal-to-noise ratio with an 8-ohm load from 10 Hz to 24 kHz with “A” weighting was –99.04 dBrA.

From the Dolby Digital input to the loudspeaker output, the left channel measures –0.30 dB at 20 Hz and –0.11 dB at 20 kHz. The center channel measures –0.31 dB at 20 Hz and –0.12 dB at 20 kHz, and the left surround channel measures –0.30 dB at 20 Hz and –0.11 dB at 20 kHz. From the Dolby Digital input to the line-level output, the LFE channel is +0.07 dB at 20 Hz when referenced to the level at 40 Hz and reaches the upper 3-dB down point at 82 Hz and the upper 6-dB down point at 102 Hz.—MJP