Audibility of Audio Power Amplifier Distortions
Reply #62 – 2014-11-29 16:31:53
Amir, regarding the Listening Tests of Audio Power Amplifier distortions you have done . Before we go there, I have fully documented Arny and friend's tests here. Let's make sure you know how to respond to them before we talk about something else. I will answer on behalf of Arny the questions below and see what you do with them.Please list your: Set up, equipment, sound room noise levels, etc. He explains the source (turntable), speakers and of course amplification. No mention of sound room noise levels. And no mention of "etc."What AB and class D amps were compared? He has compared two 200+ watt class AV amplifiers.Who/how was the testing run while you "listened". We don't know who was there when the three of them did the testing. We have to take their word that the results are as they are and they have "proven" that amplifiers sound different when tested on supposedly transparent performance (THD less than 1%).What was the listener training? I seem to recall Arny saying there was some training but none is indicated in the article.Was ITU-BS-1116 adhered to , as Amir the Pro/Industry Insider/Objectivist preaches, unlike the clumsy hobbyist M&M testing? No, it was not compliant with BS-1116.Can you post the statistical results? Sure. Here they are:Did you find any correlation between the harshness heard and price, or the fact that you purely coincidentally peddle the brand that "won" the audibilty test? They did not. They found the cheaper amp to be the better one even though a double blind ABX test is not revealing that way. That information must have come as a result of post-hoc analysis or the test was not really blind.TIA. cheers, AJ You are quite welcome Ammar. Would be great to see what you do with the type of information you seek. And satisfy Chu's desire for scientific inquiry.