Absolutely agree with all of that post (funny, I thought I saw it earlier?)
Distinguishing between two good amplifiers operating between noise and clipping is very much more difficult blind than sighted, but it IS POSSIBLE
Equally, sighted tests are very much less reliable than blind, but they're NOT ALWAYS wrong. Long story coming.
Nick
Edit: The long story. I used to be a very active member of AVForums, swapped gear with friends, and did lots of blind group listening tests at local dealers. On 26 Jan 2009 ( a day I remember well) I got my hands on a BDP and AVP that could both do HD codec decoding. I'd become quite obsessed with jitter at the time, and expected that processor decoding would sound better than player decoding due to the different digital audio replay architecture (how the audio clock is regenerated in the processor). Conventional wisdom was that they should sound the same because bits were bits, but I thought I knew better than everyone else, and several users had already claimed to hear a (sighted) improvement with processor decoding. I wanted to prove that I understood what made HiFi tick, and also to prove that I had golden ears. I could hardly wait to listen and confirm my convictions for myself. The anticipation had built up for some time, and I wonder if you can guess what happened next? I played a Bluray with a particularly musical HD audio soundtrack with the player configured to perform the decoding and output LPCM audio, and listened as closely as I could several times. Then I set the player to output bitstream, and listened with great expectation. Hard as I tried, I could hardly hear the slightest difference between them. I posted on AVF that "the difference was so small that I doubt I could tell the difference reliably". This was hugely disappointing and embarrassing, having firmly planted myself in the "processor decoding is better" camp. However, I owned up to the fact that I was wrong all along, or else I had cloth ears. After covering myself in shame (you can see this was a big deal to me) I went back to the lounge and looked at the Bluray case again. I hadn't realised that the BD soundtrack wasn't lossless compressed Dolby TrueHD or DTS-MA after all, but was in fact an LPCM soundtrack. Therefore the player had been outputting LPCM in both cases, so the audio replay architecture and hence the sound quality would have been the same. But I didn't figure this out until afterwards. During the comparison I thought I had been listening to two things that should have been technically and audibly different, so expectation bias was running riot. I knew what I was going to hear beforehand, but I didn't. Subsequently I played a different disc with a TrueHD soundtrack, and processor decoding sounded better after all, and I was happy again. The point is that my comparison was not compromised by being sighted or biased, and where there was in fact no difference at all, that was what I heard. I can't speak for everyone else, but I think I did prove to myself that I don't imagine what I hear. Not everyone gets this, but my hopes are up with an ASR audience.
(The player was a Denon 3800 and the processor was an Onkyo SC886, and other equipment combinations may have given a different result.)
Right, some impressions. There's a great deal to say, and I won't be able to do it all at once. I've had the golden opportunity to answer a lot of questions, many of which relate to the Denon DVD 3800BD. For the purpose of this thread, though, I'll just consider it as a good HD MC audio...
www.avforums.com
Nic