I listened to a promo pair of these a few months ago, and I was finally impressed with the sound of Class D.
But they were driving expensive two ways with an easy load, and in particular the ribbon tweeter was a nice flat 6ohm load impedance and flat small negative phase angle, which can to my ears make Class D sound not so good if it wanders too much in impedance and phase angle. So I wasn't sold, and have no opportunity to hear them on something more taxing to Class D. in the HF
From what I gather they do stray from just the off the shelf NCore design, as I believe that Belcanto have do their own output filtering which is tricky, and from what I gather it's a few series up filters so they can still push the power though them without blowing them, yet get a sharper rolloff to get that nasty switching noise killed off without effecting the audio band too much. But then series'ing up filters has it own set of problems, eg ringing again?? At least their trying.
Still to me the best way is to increase the switching frequency at least 5-10 times higher than what technology can do now. Then in the future when the technology allows this to happen, just a single filter will do the job of killing the switching frequency noise without it's artifacts being anywhere near the audio band.
Cheers George
