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For some reason, many A/V receivers, (some expensive one's too) have fairly high THD levels....(some approaching 1%)
Try to get the lowest THD you can.....0.05THD, or less for clean power.

When a manufacturer show really high THD levels, it's usually so they can pump up the spec for power (watts). The amp may be clean at 40WPC @ 0.05% THD... but they can show that you can get 200WPC if you allow 0.75% THD for instance... kind of like those 200W PMPO computer speakers you used to see everywhere... RMS power they were maybe 1W, but Potential Maximum Power Output, they could be listed as 200W... so awesome.

Bren R.