@atmasphere , Ralph, would you ever get caught building a class D amplifier? Seems like the antithesis of what you are all about. Class D amps can sound very good but there is no magic there, not like your amps, Pass amps or John Curl amps. I have never heard Boulder or Constellation amps. With good speakers it is that magic that counts. So what if it is harmonic distortion. Us audiophiles just want to be happy and a great amp is like catnip. Class D amps just do not get me high, at least yet.