The NAD/PSB curve is an additional target curve. Otherwise, the codes/algorithms/programs that AS supplies to the different mftrs are identical, coming from the horse's mouth.
The implementations may* differ in how the receiver assigns BM. For instance, I know with Onkyo, if AS decides any speaker has the -3db cutoff below 80hz, it simply assigns it as full-range/large. This is why we AS users are often going into the menu to assign xover after AS calibration. There may be some communication/lobbying between AS and mftrs about this type of issue in the future.
This is fine, because AS corrects down to the cutoff. IOW, raising xover has no ill effects. The problem arises with cube/tiny speakers. Say that AS decides the cutoff is 150hz, but the consumer desires a 100hz xover point. That 50hz range will never have been corrected for by AS.
I've mentioned the PSB curves on several occasions regarding NAD products. I don't assume that everyone remembers anything I might've said on multiple occasions, but I am just a tiny bit surprised you didn't notice since I know of your affinity for NAD products, at least historically.
FWIW, Alimentall is extremely opinionated. While he might hate the stock curves, there was a recent poster here at AH who just said he didn't like the PSB curve. In any case, Alimentall is a big time proponent of NAD, PSB, NHT, etc, and yes he sells all of those. He despises B&W, and no he doesn't sell those. He also might be the only person I've seen claim that he can distinguish driver material blinded, IIRC. Interesting fellow, yes.
