AV Receiver Reviews

Five channels driven continuously into 8-ohm loads:
0.1% distortion at 81.0 watts
1% distortion at 95.1 watts

Seven channels driven continuously into 8-ohm loads:
0.1% distortion at 77.7 watts
1% distortion at 88.9 watts

Analog frequency response in Direct mode:
–0.05 dB at 10 Hz
–0.01 dB at 20 Hz
+0.03 dB at 20 kHz
–2.56 dB at 50 kHz

Analog frequency response with stereo signal processing:
–0.11 dB at 10 Hz
–0.03 dB at 20 Hz
–0.18 dB at 20 kHz
–62.97 dB at 50 kHz

This graph shows that the TX-NR609’s left channel, from CD input to speaker output with two channels driving 8-ohm loads, reaches 0.1 percent distortion at 105.6 watts and 1 percent distortion at 124.3 watts. Into 4 ohms, the amplifier reaches 0.1 percent distortion at 146.8 watts and 1 percent distortion at 188.6 watts.

There was no multichannel input to measure. THD+N from the CD input to the speaker output was less than 0.008 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 –88.28 decibels left to right and –82.77 dB right to left. The signal-to-noise ratio with an 8-ohm load from 10 hertz to 24 kHz with “A” weighting was –105.07 dBrA.

From the Dolby Digital input to the loudspeaker output, the left channel measures –0.01 dB at 20 Hz and –0.08 dB at 20 kHz. The center channel measures –0.01 dB at 20 Hz and –0.09 dB at 20 kHz, and the left surround channel measures –0.01 dB at 20 Hz and –0.09 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 118 Hz and the upper 6-dB down point at 121 Hz.—MJP

Video Test Bench
The Onkyo turned in an excellent set of Video Test Bench results, especially given its relatively low cost. The only shortfall was a failure to pass the highest chroma resolution horizontal burst frequency on the component input, although I didn’t notice any issues with normal viewing material. In most of the other 3:2 and 2:2 tests, it locked onto the cadence in quick order and passed each of these tests with flying colors.—DV