Ooops...I jumped the gun on the specs regarding PWM that the Nuprime has the highest switching frequency at 700kHz. I was incorrect. My apologies for the slip. As George has already pointed out the Technics SE-R1 switches at 1.5 millionHz over double the Nuprime but after comparing both pieces, the Nuprime is a superior design with higher power output and far more efficient and runs cool. I thought Class D has evolved to the point where heavy amps are a thing of the past. So Technics puts out a Class D amp that weighs 119 lbs., runs hot with three heat sinks and four vents on top. Thats not very good engineering compared to Bel Canto, Mola Mola, and Nuprime. The Technics looks more like a hybrid AB/Class D amp.