In a prepro you need to keep the noise floor exceptionally low as the amp will raise it by its Gain (think the ADAs have a 29x voltage gain which weirdly enough is the same number in db ...29db).

But you are right there are limits to numbers. In this case I’m looking to justify the extra $3500 for the 90 over the 70 ... and don’t have enough info other then what mojo mentioned to support it (4 subs and “it’s better”). I doubt I’m going to find enough real world value once the numbers are in.

BTW, thanks for the link... I read it a while back but would have been interested if I hadn’t (been following ASR for a while now). Amir is pretty hard on the ratings ... you have to read the review and evaluate the numbers your self ... although I think he’s softened up a bit lately.