I used. Big ole Adcom and B&K amps for years to give me my 200watts, but with lots of heat. I switched to Bel Canto monoblocks and could not be happier. They stay on and stay cool all the time. I have the 500m, the new 600m is supposed to be the best yet. You can also get used 500m or 1000 mk2 for a relative song. i know, they are class D. I have no issues with the sound, but i did get improvements with power cables (Acoustic Zen) and Nordost cabling, especially Heimdall 2 XLR form the preamp.