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I would take a guess that:
a) Manufacturers know very well SINAD, unless noise dominated in an extreme way, does not correlate well with perceived sound quality by most AVP/AVR users, let alone separates audiophile users.
b) They also know most users are not very technically oriented, most don't know how to interpret the detailed DAC specs on datasheets either, even if they see them, and in most cases they don't see them, and/or have no interests in those things, it's just too much work for them.
So, manufacturers might just focus more (rightfully in most cases I guess) on things that potential buyers would focus on, things like power output, power consumption, dac brand, example: many do know/think ESS Sabre stuffs are good, not know that it depends on the specific modes such that there ESS dac chips that has lower specs than TI, AKM, Wolfson or vice versa, as DAC manufacturers do offer at least several chips, at different specs and price points for their customers to choose from. They might also face marketing conditions that would force them to choose specific parts such as DAC, OPA ICs (chips) based on prices, unit price for those ICs are very sensitive to sales volume, among other factors so their prices would fluctuate. For example, there seem to have no good reason for D+M, Onkyo, to choose the PCM5100 series DAC ICs based on the much lower specs, but it might be possible that there were offered irresistible prices at the time, when TI knows full well that due to the shortage of the AKM ICs, it was a great opportunity for them to off load their inventory of those ICs (the PCM5100/5101/5102 that might be close to their retirement age lol.
In my opinion, there may or may not be any point chasing higher SINAD that is higher than a certain point, and that's why a few years ago, I would not have suggested anyone to choose something like a Marantz SR7012 or 7013 over the Denon AVR-X4400 or X4500H for use as AVP, knowing full well the Denon models had 25-30 dB higher SINAD on the test benches if the premium for going with the Marantz were $500 more based on list price, but at several points on the time line, I almost bought a SR7012, 7013 just for back up to my X4400H, because they were on sale at price level significantly lower than that of the AVR-X4500H!! Reason is, the Marantz models were measured at 75-76 dB SINAD, same as the AV7705 AVP, and you look at the FFT, you can see clearly that the make up of the 75 dB total are mainly the 3rd and 5th harmonics and the 5th barely exceeds -90 dB with noise included at that point, so in this example I wouldn't be concerned about hearing distortions, and if I do, I might not be offended by it at all, some people even enjoyed that little bit of salt and pepper.
So, to me, the reasons I would/might still chase SINAD (only to a point) are the following:
a) Higher SINAD is a reasonably reliable indicator that the product is engineered well, for example, we have to give D+M the credit, that they manage to implement the TI DAC IC, with SINAD specs of 93 dB, to achieve high SINAD in the range 87 to 93 dB on the ASR test bench for the X3800H through Cinema 40.
b) Anthem AVM90 is probably the only one at the time of launch that utilized the flagship (not now but back then) ESS Sabre DAC IC, namely the very expensive ES9038Pro used in many separate desktop DACs that Amir had measured over the years, that thing's SINAD spec is a truly whopping 122 dB and DNR of 132 dB (best conditions)!! Yet, on the benches it only achieved about 103 dB, so no one can claim logically that the AVM90's >2X the price of the AVM70 can be justified on the much raved claims (see fans on that thousand page AVM70/90 thread on AVSF) that the 90 sounded so much better because of the better parts and circuitry used in the 90 over the 70.
The above two examples (there are many of course those are just easy picks) show smart shoppers might need to dive in a little deeper, if they are to decide on whether to pay more for the SINAD, but is sort of irrelevant if one don't care much about SINAD as in that case just go with features, aesthetic, perceived reliability, after sales support and obviously, price.
c) Lastly, if the unit under consideration has the needed features, and the price is right but SINAD is below say, 75 dB, then regardless of 65 dB might be transparent enough, I would still avoid the product because I don't like the feeling of not understanding why such a product cannot do better than 75 dB SINAD. One argument against the product could be, if it does rather poorly, or say unimpressively in that one metric, what other negatives would there be on this product overall? I don't know the answer but I think it is a fair question.
d) This is actually relative to c) above, that is, if SINAD is 75 dB on Amir's test bench, we must take a look of the other metrics he tested/measured, such as IMD and frequency dependency because the 75 dB is for testing at 1 kHz, so at 5-7.5 kHz, SINAD might be as low as 65 dB or even 60 dB, and we all know that if THD+N is bad, IMD might also take a hit because the two are related. In a sense, we need some sort of buffer, or headroom?
Now, AV10 and AVM90 owners like you, would not have to be concerned about any of my points above, that for just this reason, it is well worth the high $ you guys pay. You can just sit back and enjoy your gear, knowing that they are transparent and will sound great as long as the source you play are well recorded and mastered. Anyone who try to convince you that his/her gear wound better would just be their opinions, likely based on not doing their listening in apples to apples comparisons.
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It still makes me laugh that on ASR the Denon 3600, 3700 and 4700 AVR's all measure higher than the 3800 and 4800. That's progress.