Nova uses The new Threshold 300 watt amps. or you could step up to the ATC-SCM20's. here is the link to Nova below. http://www.novaaudio.com/products/applauses.html
i also think tannoy makes some active speakers, but i could be wrong about that.
if you go fot the ATC's, though, you'll never look back. i use all ATC's in my system (two 50's and 3 10's) and will never use anything else again. (at home, anyway)
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