Has anyone heard the SimAudio 650D?

I have a 650D but didn't do a lot of comparisons with other high end players. Compared to my previous Marantz 11s1 player, which was very good, the 650D retains the warmth and musicality of the Marantz but is significantly more detailed and revealing at the same time. The 650D sound is really magical in that it somehow gives you the best of both worlds in terms of detail and musicality, rather than sacrificing a little bit of one to get a bit more of the other. Great recordings sound great but poor recordings remain enjoyable as the 650D adds no grain or harshness to the high frequencies (conversely, it sweetens the high frequencies a little without sacrificing any extension or air). Some reviewers describe it as having an "analogue" sound. I think it's the distinct lack of digital grain and glare that gives this impression - the sound is smooth and natural like analogue but does retain the high frequency extension of digital.

I tried the 750D briefly as well. It is even more detailed, leaning a little more towards the "ruthlessly revealing" category. Great recordings sound FANTASTIC but poor recordings sound like poor recordings. It is not a night and day difference from the 650D but there is a difference and I think a lot of listeners would prefer the sound of one over the other based on personal taste and their music library moreso than an outright preference for the more expensive 750D. In fact, in one of the articles the reviewer mentions that Simaudio told him they purposefully "tuned" the 650D to sound more analogue-like than the 750D so they could cater to different tastes with the two models.

Maybe Stereophile felt that they couldn't put both the 650D and 750D in Class A for some reason and that's why the 650D is in Class B? I can't see it having anything to do with performance - it is a top notch player and dac.

Camb,
Stereophile has not reviewed the 750D....it's not in the rankings at all. I actually erred in that the 650D is in the A Class, while the Playback is A+ which still doesn't make sense according to Fremer's review, unless the lack of SACD capability of the former is the culprit. I noticed that the Sony 5400 SACD player as stock is ranked A+.....does this mean the Modwright version would be AAA+++???
I tried out the 750D at home and found it a little over-the-top, kinda hi-fi sounding.

Yeah, the 750D is very "analytical" and almost hyper detailed. The 650D is much smoother and "analogue sounding", as Fremer found and mentioned in his review.

I'm curious to see how much the addition of outboard power supplies for the 650D and750D (to be offered by Simaudio soon, I believe) will improve the sound of these units. I'm sure Stereophile will do a follow up review at that point.

Without getting into the debate of the wisdom of Stereophile's rankings, I believe that the A+ class is only for player's performance with hi-rez media, which the Simaudio lacks.

Thea 650D does handle high resolution files. Initially its USB input didn't handle high res files but it now does and older units can have the USB updated to the high res version. All other inputs have always handled high res files.