I also cannot comment on the 7500, but the 990 works wonderfully with my 1.6s and CC3 as well as the 3.6s which I just auditioned in my home. Maggies love current, so if there's any chance that you're going to step up to the 3.6Rs any time in the near future, I would look at amps with a bit more wattage than the 7500.