AV Receiver Reviews

Five channels driven continuously into 8-ohm loads:
0.1% distortion at 37.6 watts
1% distortion at 44.0 watts

Seven channels driven continuously into 8-ohm loads:
0.1% distortion at 29.5 watts
1% distortion at 37.8 watts

Analog frequency response in Stereo mode:
–0.48 dB at 10 Hz
–0.15 dB at 20 Hz
+0.33 dB at 20 kHz
–2.31 dB at 50 kHz

Analog frequency response with stereo signal processing:
–0.47 dB at 10 Hz
–0.15 dB at 20 Hz
+0.34 dB at 20 kHz
–2.30 dB at 50 kHz

This graph shows that the R-904N’s left channel, from CD input to speaker output with two channels driving 8-ohm loads, reaches 0.1 percent distortion at 55.8 watts and 1 percent distortion at 98.0 watts. Into 4 ohms, the amplifier reaches 0.1 percent distortion at 23.8 watts and 1 percent distortion at 82.6 watts.

There is no multichannel input to measure. THD+N from the CD input to the speaker output was less than 0.032 percent at 1 kilohertz when driving 2.83 volts into an 8-ohm load. Crosstalk at 1 kHz driving 2.83 volts into an 8-ohm load was –63.16 decibels left to right and –62.88 dB right to left. The signal-to-noise ratio with an 8-ohm load from 10 hertz to 24 kHz with “A” weighting was –96.68 dBrA.

From the Dolby Digital input to the loudspeaker output, the left channel measures –0.15 dB at 20 Hz and +0.73 dB at 20 kHz. The center channel measures –0.15 dB at 20 Hz and +0.96 dB at 20 kHz, and the left surround channel measures –0.16 dB at 20 Hz and +0.77 dB at 20 kHz. From the Dolby Digital input to the line-level output, the LFE channel is +0.00 dB at 20 Hz when referenced to the level at 40 Hz and reaches the upper 3-dB down point at 108 Hz and the upper 6-dB down point at 115 Hz.—MJP