The Future of Audio Amplification

How am I playing both sides of what fence?

The selling propaganda fence of http://tweakaudio.com/ $60 plus audiophile mains fuse.

If there a buck to be made from the gullible with snake oil products, mains fuses would have to be at the top of the list.

I will not longer respond to you, George

. I’m devastated

ME
Typical of kalali to slur, when can't understand, he can’t see the forest through the trees.

I will be A/Bing my super tweaked dual mono IceEdge based amps with the BHK.  We shall see what we get.

You and Ralph both, then we can have a clam bake. And you two can have it out.

I repeat,  Blind Freddy can see that.

600khz v 1.5mhz switching frequency
The higher the switching frequency the higher the low order output filter can be set, so by the time the residual reaches 20khz what’s left with the 1.5mhz is down nearly 3 lower in amplitude and has less phase shift in the audio band than that of normal 600khz switching frequency. Blind Freddy can see that.

the noise problem is dealt with through good layout and compact (surface mount) design.

Really then no one one yet has been able to rid of this, and they are mightier minds than you. Only Technics has so far been able to reduce it greatly, with double the switching frequency speed and then the normal output low order filtering of it.

As you can see in this simulated 1khz square wave shot, the ideal is the "grey" square wave no ringing.
The "red" is the what’s available today and it hasn’t changed, the last photo below is whats representative of today’s class-D’s
The Technics is the "blue" uses the GaN transistors, very fast quickly settling and reduced ringing, much closer to resembling the ideal grey square wave.
https://ibb.co/87Kh2mV

And now bench tests of Stereophile, use a special very low power high order -100db line filter between amps output and test gear input.
(Audio Precision’s auxiliary AUX-0025 passive low-pass filter),
Which eliminates noise between amp’s output and test gear input so reader can’t see it anymore.

1khz square wave with AUX-0025 filter in place:
https://www.stereophile.com/images/1212AM1fig03.jpg

1khz square wave without AUX-0025 filter in place:
https://www.stereophile.com/images/1212AM1fig02.jpg

Cheers George

My amps are using the latest Icepower modules (IceEdge) and switch at 500K......however, with the right massaging, they produce sound that is beyond my own designed class A amps

I see just someone shilling his wares.
Massaging 500khz switching frequency will only get you half the way to a happy ending.
Try 1.5mhz like Technics did, and you'll finish on a bigger high. Or 3mhz and you be in orbit.
It will come soon enough, as I said EPC the makers of Technics SE-R1 GAN transistors are the Formula 1 pioneers of the Class-D world, just like they did with Mosfet transistors many years back, and look how quick they took off, must have made EPC some crazy big royalties, they are inventors that sell their patented inventions to the highest bidder. The forula 1 guys of Class-D.

http://epc-co.com/epc/AboutEPC/Team.aspx

http://epc-co.com/epc/Applications/ClassDAudio.aspx

Cheers George

I have looked over that Technics technology and hope that it may trickle down into more affordable components as right now 20k is a very hard sell to non believers.

It like everything in technology life it will come to the masses. Just look at all the Formula 1 improvements that all come to your family car within a very short time.

Hopefully somebody can make it happen for a lot less dollar!

It will, those same EPC guys who made the GAN transistors for that Technics SE-R1, were also the inventors of the "power mosfet" many years ago.
They are the inventors (Formula 1 guys) and they sell their inventions to the big semiconductor manufacturers, who then stamp them out by the thousands, and supply them to the masses.

Cheers George

" Where are we at with class D right now? Everyone keeps saying that the future is class D but where is that in the future?"

I do too, and it will come, when they've got it all right, with no compromises. 
When they get rid of it's "flaws".

Every detractor of Class-D never complains about it's bass or upper bass or even lower mids, it's always about the upper mids and highs.

Technics with their  $20k  SE-R1 have broken the Class-D norm and got most of the way to fixing these "flaws", by using a switching frequency at twice the norm, instead of around 600khz they've gone with very special GAN components to double the switching frequency to 1.5mhz, (3mhz would be better) this then allows the low order switching noise output filter to do it's job completely without leaving any effects and any left over switching noise artifacts within the audio band. 

Cheers George