Do you think it could match with the Ushers?What is your opinion about the MD 2?
The characteristics of the HK990 aren't too disimilar to the Hypex Ncore - neutral with a slight hint of warmth. So I suspect it could work well together. As for the speakers themselves, they're a great improvement over the Performance 6s. What was said about them in the hifi world review is correct, essentially. Very honest and rewarding. Just bare in mind their depth, they have some seriously deep cabinets.
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Forgot to mention it took me a few days to sell my HK990. Infact, I just PM'd someone who said they were interested in the amp and it was done.