AV Receiver Reviews

Five channels driven continuously into 8-ohm loads:
0.1% distortion at 79.1 watts
1% distortion at 95.5 watts

Seven channels driven continuously into 8-ohm loads:
0.1% distortion at 78.7 watts
1% distortion at 94.6 watts

Analog frequency response in Pure Direct mode:
–0.08 dB at 10 Hz
–0.03 dB at 20 Hz
–0.06 dB at 20 kHz
–2.68 dB at 50 kHz

Analog frequency response with stereo signal processing:
–0.32 dB at 10 Hz
–0.10 dB at 20 Hz
–0.28 dB at 20 kHz
–56.43 dB at 50 kHz

This graph shows that the TX-NR5008’s left channel, from CD input to speaker output with two channels driving 8-ohm loads, reaches 0.1 percent distortion at 162.8 watts and 1 percent distortion at 194.1 watts. Into 4 ohms, the amplifier reaches 0.1 percent distortion at 248.1 watts and 1 percent distortion at 309.5 watts.

Response from the multichannel input to the speaker output measures –0.08 decibels at 10 hertz, –0.03 dB at 20 Hz, –0.06 dB at 20 kilohertz, and –2.72 dB at 50 kHz. THD+N from the CD input to the speaker output was less than 0.027 percent 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 –89.11 dB left to right and –82.03 dB right to left. The signal-to-noise ratio with an 8-ohm load from 10 Hz to 24 kHz with “A” weighting was –106.30 dBrA.

From the Dolby Digital input to the loudspeaker output, the left channel measures –0.02 dB at 20 Hz and –0.24 dB at 20 kHz. The center channel measures –0.02 dB at 20 Hz and –0.25 dB at 20 kHz, and the left surround channel measures –0.02 dB at 20 Hz and –0.25 dB at 20 kHz. From the Dolby Digital input to the line-level output, the LFE channel is +0.01 dB at 20 Hz when referenced to the level at 40 Hz and reaches the upper 3-dB down point at 96 Hz and the upper 6-dB down point at 120 Hz.—MJP

video test bench The Onkyo’s digital processing (HDMI in to HDMI out) was excellent apart from a single shortcoming—a little too much visible rolloff in the highest-frequency Digital Chroma Resolution burst for a clean Pass score. The receiver did fail to pass both above white and below black on the Analog Video Clipping test (oddly, this failure was not duplicated in the less expensive Onkyo HT-S9300THX reviewed elsewhere in this issue). It also failed our Analog Chroma Resolution test.

The Digital Video Clipping and Resolution tests were run with a 1080p source and the video processing set to 1080p, and also with the same source passed directly through the AVR’s switching circuits in Through mode, bypassing the video processing (at least in theory). The results were the same in both cases.

The Analog Video Clipping and Resolution tests were performed with a 1080i input. With rare exceptions, Blu-ray players will not output 1080p over component.—TJN