George makes up something untrue about Merrill amps and all he can do is say that whatever I say is biased because I am selling something. The truth comes from different places.....even from manufacturers. My amps will speak for themselves. If they are good, they will sell. Trust no one (neither George, nor me nor anyone). Trust your ears. Listen and decide. You cannot know anything about how something sounds without listening to it. Class D (and all classes) are getting better and better. Whatever you heard before is not what is best today.
All class D amps have the switching noise superimposed on the audio signal. However, how much does a low level 500K sign wave affect the sound you hear? Pretty dang far out of the audio band. It does make sense to use a higher frequency so you can filter higher and have even less noise......but how much does it do audibly? Only those that have tried it know. All else is a guess. Personally, I believe it would make more difference to use better coils and caps on the output of the amps. Cryoed PCOCC inductors and super capacitors would give way better sound. No one is doing this. The future is bright indeed.
Now, single speed DSD has a problem with noise, for sure. The noise at 50K is a lot and that can fold down into the audio band. I read somewhere that double speed DSD has 40db less noise at 50K (40db is 100X!!!). No wonder it sounds better. Quad speed is a little better yet.
It will be at least 5 years before there is an absolute state of the art class D amp. There might? be something like that available now in class A in the AudioNet latest amps ($105K the pair)......or maybe the D'Agostino monsters ($250K the pair.....and 574lbs each).
http://www.hifiplus.com/articles/raising-the-bar-a-preview-audionet-stern-preamplifier-and-heisenberg-monoblock-power-amplifiers/
