Onkyo TX-SR606 7.1 A/V Receiver


On the Bench (JEJ)

All distortion measurements were conducted within an 80 kHz bandwidth and two channels driven.

In the CD Direct mode, 1 kHz into 8 ohms, THD+N was 0.03%

Switching to the VCR input, which uses DSP, the distortion spectrum was quite different. Distortion was higher, as was the noise floor. I used the CD Direct mode for all subsequent tests.

At 1 kHz and 20 volts into 8 ohms (50 watts RMS), THD+N was 0.025%.

At 10 kHz, distortion rose to 0.085%.

IMD at 50 watts output was 0.085%.

THD+N vs. Frequency is shown below. Distortion maxes out at 0.12% at 20 kHz with 50 watts into an 8 ohm load.

The 606 probably should not be used with 4 ohm speakers, judging from the fact that the knee of THD+N vs. Power output at 4 ohms is at 90 watts, which is the rated output into 8 ohms. At 4 ohms, clipping (1% THD+N) was at 160 watts.

Frequency response was 10 Hz - 200 kHz, - 3 dB at 50 watts RMS output into 8 ohms.