Class D is just Dandy!

the idea that anyone would run one without the filter is ludicrous.

Your scare mongering.
No one said run or listen to class-D without the output filter, it said to "look" at it. Whichimplied to see it on a scope as that’s what was being discussed, comparing input wave form to output wave form, far from the same or what your implying.

For those that wish to see what goes in and what comes out between Class-D v Linear amplification which is closer to the original input, or closer to "straight wire with gain" as what was the start of this

Test input:1khz perfect square wave
http://www.tronola.com/moorepage/Sine/1kHzsquare.jpg

Output: Class-D:
https://www.stereophile.com/images/archivesart/406Halfig01.jpg

Output:Linear Amp:
https://www.stereophile.com/images/archivesart/999A565fig2.jpg

georgehifi happens.

Oh dear, you never did forgive me for exposing the JR Continuum 2 re $100  Class-D module con.

For those that wish to see what goes in and what comes out between Class-D v Linear amplification which is closer to the original input, or closer to "straight wire with gain" as what was the start of this

OK so here is the input, 1KHz

Test input:1khz perfect square wave
http://www.tronola.com/moorepage/Sine/1kHzsquare.jpg

But here we see a 10KHz waveform, which is difficult for many amplifiers. Imposed on top is the residual, which is about 250KHz, which is low by modern class D standards:

Output: Class-D:
https://www.stereophile.com/images/archivesart/406Halfig01.jpg

Note the scale on the left side of the image- its not there! There's no way to tell how strong this signal is, but the residual is a clue; its about 1/4 the total waveform amplitude. Since we don't know the power of the amp, we can't say how high this should be but if its 0.25 that would fit for an amplifier that makes 100 watts. If that is so, the amplitude here is half that of the waveform in the the next image, which is 1KHz instead of 10KHz!

Output:Linear Amp:
https://www.stereophile.com/images/archivesart/999A565fig2.jpg

George's attempt to put class D amps in a bad light on this account is debunked.

It appears instead there is an attempt to mislead people by a of slight of hand, which doesn't win street cred. The factor of 10 between 1KHz and 10KHz is pretty significant! In order to reproduce a 10KHz squarewave the amp needs bandwidth past 100KHz. That's hard for most amplifiers, tube, solid state or class D.

George, if you want to show how class D falls right flat on its face, show a 10KHz input waveform and the same 10KHz output waveform **at the same amplitude** of two example amplifiers. Make sure the outputs are shown at the same amplitude as well. Doing what you've done here is not just sloppy, its looks deceitful as well.

Sorry you started it all with this little misquoted rant.

"The idea that anyone would run one without the filter is ludicrous."

And I said in reply " No one said run or listen to class-D without the output filter, it said to "look" at it with a scope.

Your in product protection mode, and that says it all.