Just be lucky it isn't a KingRex QS-1 amplifier based on the Tripath chip. Customer sent one of these to me across country to convert to 110v operation. When I tested it, the waveform on the scope was thick with RF hash. On the spectrum analyzer it was putting out 875KHz just 30 dB below the amps' 50W output, with harmonics every octave up to about 4.5Mhz. Ended up modding his amp after informing him that his neighbors might complain (speaker wire makes a decent antenna for radiating this hash). A lot of new audio gear is RF noisy, but the Tripath stuff is over the top noisy.