Class D

That's why it's seems only fixable by moving the switching frequency and filters way up higher so there's no effect of phase integrity down into the audio band, and the only way to do this is move the switching frequency up much higher to 1.5mhz and the filter as Technics did with the SE-R1 and hopefully with the SU-R1000 also.

And you can't fix it but throwing "more global feedback" at it, as that is a sound destroyer in itself. The only way is the > 1.5mhz switching frequency, so the filter can do it's job without introducing phase problems down into the audio band.

Rubbish. Bruno Putzey's UcD module, which is quite old at this point (and predates NCore and Hypex), has less than 1 degree of phase shift at 20KHz. It switches at 400KHz and is self-oscillating, with about 40dB of feedback.

Rubbish. Bruno Putzey’s UcD module, which is quite old at this point (and predates NCore and Hypex), has less than 1 degree of phase shift at 20KHz. It switches at 400KHz and is self-oscillating, with about 40dB of feedback.

Serious!!! your rubbish, those things have always sounded crap in the upper-mid/highs, most probably because of all that global feedback, that’s why it’s considered an ok bass/sub amp.

The original UCD module had lots of feedback.....all around the output coil....The Ncore modules added even more feedback and the Purifi adds even more feedback.  Most people feel the Ncore sounds better than UCD and Purifi sound better than Ncore.  Read the reviews of the "super high feedback" Purifi amps.......they like them.  I am not a FAN of feedback....nor am I not a FAN.  There are lots of ways up the mountain.  Again, everything matters.  One amp with 500K switching could sound way better than another at 1meg switching.....or visa versa.....One amp could sound better with more feedback....or with less feedback.....it is not one thing......everything has to be done well.  

that you lie or get hostile about something

Hey sunshine, if you look back just one post, it's Ralph that got hostile calling rubbish on me first, I just reciprocated the same back, get a life, or stop shilling/stalking