@PENG - Have you found these SINAD testing results translate into audible sound differences? If you take the Benchmark AHB2 and compare it against the Outlaw 5000 will you be able to easily recognize the difference? That would be a 113 measurement against 79 or a 34 point difference.\n\n\nI have not "found" that as such, but of all the amps I currently have, none of them have what I would consider audible distortions. So I can only assume if I can AB comparison an amp that has 80 dB SINAD vs one that has only 50-55 dB I may be able to hear a difference because I think I am very sensitive to distortions.\n\nEven the NAD T758V3, the worse AVR Amir measured in terms of THD+N has SINAD of about 52-55 dB in the 0.2 to 0.5 W output range. At such level (0.2 W) I would be listening to about 77 dB average from my seat, so even 50 dB SINAD, that is -50 DB THD+N would be mixed in with my HT room's noise floor already. That's does not mean it cannot be heard, but I don't believe it would be "easily" recognizable. I know a lot of people will disagree with me for sure, but you know I am the type that go by scientific facts only. I just don't see how one (or just me anyway) can tell the difference between the harmonics (the distortions components) and noise if they are all going at the same time with the distortion harmonics well below the average noise level, not easily for sure.\n\nBenchmark will also disagree with me, but may be not because they clearly use different assumptions that don't reflect to real world use such as mine and I bet your as well. \n\nTheir points:\n\nhttps:\/\/benchmarkmedia.com\/blogs\/application_notes\/power-amplifiers-the-importance-of-the-first-watt\n\n"The following graph shows THD+N vs Power where THD+N is dB relative to 1 watt. This scale-factor makes it easy to calculate the sound pressure level of the distortion signal when it drives speakers. For example, if the speaker sensitivity is 87 dB, 1 watt, 1 meter, the distortion sound pressure level produced by the conventional amplifier at 1 W is (87-70) = 17 dB SPL. At this same 1 W power level, the distortion sound pressure level produced by the AHB2 is (87-108) = -21 dB SPL. The negative number indicates that this distortion signal should be 21 dB below the threshold of hearing when played in a quiet room. The conventional class-AB amplifier produces audible distortion, the AHB2 does not." \n\nSo you can see that their point is, you need the distortions spl to be negative, that assumes your room is dead silent. Unfortunately my room has a noise floor of at least 25 dB wide band, right up to 20,000 Hz.\n\nThey also talked about how easy it was for them to score perfect in their AB listening tests, but note that they use a 1 kHz pure tone, and obviously in a deal silent room again. You can easily understand why it is easily to hear a distorted pure tone, vs real music tone that is many times more complex.\n\nNo "easy" answer to your question, unfortunately.. The safe thing to do is, all else being equal (such as cost), go with the lowest possible THD+N, if you are concerned you may be good and sensitive hearing.