The PM800X have different versions of HDAM. Also, those HDAMs in the PM series are actually doing something as they are not just an extra unity gain buffer added behind the volume control IC right at the end of the signal path. /QUOTE]
That's what I was thinking/hoping. I own a PM8006 and have to say I'm really quite happy with it. I would send it in for review, but I'm living in Germany... Would also be interesting to see measurements of a NR1710/11, as those slim line AVR should have a different architecture.....
A dozen or seven makes no difference. In terms of affordable options there are around 7 anyway if you take into account parent companies. And yes I am saying hundreds of brands are competing for other types of components. You can design a dac today and sell some. Same for amplifiers or speakers.First, I said more than a dozen brands tested here, not seven, nor what is available in the market. Do please read before you disagree. Finally, are you really saying that there are 700 Hi-Fi brands on the market competing with each other?
I think you'll find buyers make decisions more on features than sound. If that's their preference, why do you think sound should be more prioritized?I used to think that. But that isn't it. Pro gear can have much higher density and channels than AVR and the best of it is very good measurement-wise. So it could be possible to make an AVR that has great numbers, and my guess is other than bothering to make it a goal the cost vs what they have would be somewhere from minimally higher to perhaps not at all higher.
Take Marantz's insistence on the HDAM. It isn't particularly great, they make it with quite a few discrete transistor circuits. My guess is they could make an all IC version 20 db better in every metric and far cheaper. Why don't they do it? I don't know.
Why does this unit exhibit worse linarity then the first unit measured? Is the way it's measured different? Or this sample is worse then the first unit measured? There's almost 20db difference which seems significant. Also, how would we percieve bad linearity?
I didn't see any major difference between the two tested except in linearity as you pointed out but that's a difference of 2 bit, not a huge deal.
The difference in preamp/DAC SINAD is negligible if you compare them at the same output voltage level, both managed about 74 to 75 dB.
From the above charts, one can conclude that the SP-DIF coax input signal (from Amir's first benchtest in 2020) is superior to the Toslink (optical) connection from this most recent August 2021 benchtest.
I hope the AV7706 measured better. Just purchased one a few months ago to replace my old Anthem AVM50v for multichannel purpose.
I did stereo listening comparison between:
Oppo 105D (HDMI out) --- -------AV7706 ---- --------------------------Levinson---- 802D3
Oppo 105D (XLR Analog out) ----GFP750 pre-amp (passive mode) ----Levinson----802D3
They sounds very similar for pop and classical songs, playing up to 98dBC peak at 11ft listening distance.