Class D is just Dandy!

Hi @georgehifi

It is not appropriate to use an oscilloscope to measure the audibility of signals. If you are having trouble using one, I suggest going to an electronics forum to help ensure you are using it correctly, and are not connecting it in a way that leads to incorrect results.


Best,


Erik

I just replaced a Schiit Vidar with a Parasound Zonemaster 2305 and find it a great addition to my system (and I really like the Vidar!).

I can’t speak to the technology points being raised however for myself Class D gives me a level of performance that I could never afford in a Class A, A/B amp.

So while not perfect, however when compared to a similarly priced Class A amp a well implemented Class D seems to me to be a significant improvement.

JA used his high order special testing output filters because he didn't yet have the Audio Precision's auxiliary AUX-0025

That's right,  what I said and why you can't see much switching noise on the square waves Without those "special testing filters" the square wave will look like this https://cdn.stereophile.com/images/1212AM1fig02.jpg
Sorry it's is you that needs to get some tutoring on this, as I said the output filter limits bandwidth and also because it's a low order creates phase shift down into the audible frequencies. 

   

So, My two cent begins with , "Have you ever heard of (Flying Mole), amps"? I imported some of these a few years back after a friend in Japan recommended them. The one's I received were about the size of a paperback novel. They weighed under 2Lbs. and were housed in a really beautiful, single piece of "Brushed Silver finished", aluminum extrusion. With a rounded front face. Beautiful piece of gear! And at that size and weight? 160Wpc @4Ohm! They use a, "Bi-phase tech.", that they invented.
 Paired with a "Schiit", "Freya", tube pre? I found that the Freya, with, "Sofia Princess, Carbon plate", type tubes sounded amazing! Alas I didn't need them as I went in a different direction. I am kind of sorry I sold them all! They were just $220 a pair from Japan at that time. And the story was that they were being developed by the top engineers at "Yamaha", in Japan when word came down that Yamaha would stay, "A/B", when it came to their component separates. The Yamaha crew quit, and started the, "Flying Mole" company. They finished the amp and debuted them to a people un-willing to embrace the tech.  "At that time".
  I also had a 13.6.4.3, surround system for a bit in which I used
 three, "Rotel", "RMB-1575", amplifiers with allot of success. Five channels each, 500Wpc, @4Ohm, weighing in at 22Lbs. and making LESS heat than my, "Chihuahua"!
   I did go to, "All tube, All the time, though", awhile back. With, "Manley Lab's", but that will eventually change. 
 The "ZOTL", tube amps do interest me. And since I do live near to Mr. Bern and his Company. I shall be hearing a few of those soon.