Class D

@zappas -- I’m not sure if you’re still reading this, or if this point has been covered somewhere among the back and forth.

The PuriFi modules put out almost 500 watts into 2 ohms. It's easy to find the spec sheet online.

I have a pair of Apollon amps made with them, and they drive my Janszen electrostatics better than my more expensive class AB amp did. I am pretty confident they would drive your speakers fine. I don’t know anything about the PS Audio ones.

burtonjones, that is the OLD paradigm. This is January, 2021, not 2011. 

first time since gFis incessant arguing against reason or fact that he finally understood when to use your and you're

That's progress, a baby step, but progress

I did not measure the amount of residual after removing the secondary coil and caps. Since the caps to ground were just 1000 pf....I imagine that the residual looked much the same.

Controlling the residual is pretty important. Its not the sort of thing I'd leave to imagination.

Of course, I checked every channel of every amp that I sold and looked at the residual of each channel. I just did not do an exact measurement of the before and after. From what I remember, it was very much the same, about a half a volt or so of pure 500K with no added high frequency noise (but since I did not do an exact measurement then that is what I tell you I did). However, it sounded way better without the extra filter (most class D amps just use one coil and one cap per phase). if I had seen any kind of added noise on the 500K wave or a noticeable increase of value I would of taken note......there was basically no difference (that I remember). The secondary coil is 15 uh and the cap to ground is 1000pf.......so it looks like a 1.3 meg filter......that is not going to make any difference in a 500K sine wave. If you add another 1000 pf for speaker wire than maybe a hair difference. By the way, I first removed the 1000 pf caps to ground on the output and heard no difference.  But when I remove the inductor.....OMG

When Nuforce started making class D amps I was a dealer. That first amp had all kinds of noise coming out of it. One if the fixes they used was to add a secondary coil right on the speaker output terminal. When I look at the output stage of the latest class D Nuprime amps (Nuforce morphed into Nuprime) then I notice a bunch of coils near the output.....so I believe they are still doing this today. Most everyone just uses one coil and cap. More ferrite coils on the output is not merrier. How many coils (hopefully air coil) are you using on your output? Coils are not good......but you have to have one in a class D amp or you fry your speakers......so make that one the best sounding one in the universe!