Class D is just Dandy!

Actually Georgehifi, YOU made the claim the the output of Class-D is not recognizable, and then you compared the switching residue internal or external,

Go back and read a bit more carefully, please🤦‍♂️.

If the Class-D output filter is removed, then "input test signal" (not switching noise as you say) is not recognizable at the output terminals because of the switching noise monsters it.
With the filter in place, it still sad with residual switching noise, but recognizable, as to what’s going into the input.

I recently purchased a used Belles 150A V2 for my second system and I’m amazed at the sound. The rest of the kit is a Luxman C-300 pre, Cambridge Audio CNX V2 streamer, Ryan R620 speakers and Clear Day double shotgun speaker cables and Silnote Audio Morpheus Reference classic interconnects. Every time I listen I have a smile on my face. I never thought class D could sound like this after all the negatives I’ve heard...they just haven’t heard the “right” class D equipment I guess. 

dutch12
I recently purchased a used Belles 150A V2 I never thought class D could sound like this after all the negatives I’ve heard...they just haven’t heard the “right” class D equipment I guess.

Sorry to burst your bubble there Dutch old mate. But the Belles 150A V2 is a 150w Class-A/B linear amp, nothing to do with Class-D. https://ibb.co/yn8f6FJ

https://www.stereophile.com/axpona2010/advanced_transduction_belles/index.html

http://www.soundstagenetwork.com/noisy13.htm

And your right the  Belles 150A have a great sonic reputation, probably better than most Class-D, except for maybe the Technics SE-R1.
Stick with it you’ll be happy for a long while, till Class-D rids itself of it’s Achilles Heel. Like what Technics did to combat it with SE-R1, but yet to remain affordable as well, instead of being $20K.

Cheers George