Class D

This isn't a thread on what class D you like. What's the NAD's 2-ohm rating? Hmm...it doesn't appear to be published.
Look, right now there are two H2O Audio S250 Signature amps for sale on US Audiomart. These are real 2-ohm amps that handle Scintillas easily. Plus, they're under $2K. Enough said.

I don’t see anything.
That GHz comment really makes me suspect his depth of knowledge on the topic is really quite weak.

True, "you see nothing."
Please, and to state his knowledge is weak, is seriously laughable coming from you.

@georgehifi,

You have proven repeatedly you don’t have anywhere near the knowledge to make a comment on someone’s credentials. Your continued lack of understand of even the most basic aspects of amplifier operation, class-D operation, and even basic electricity make your comments on this topic meaningless.

However, someone with a basic knowledge of signal processing, the math of signal processing, noise sources in a switching amplifier, or the basic math defining their performance, or say the related math of DACs would know that a comment about needing switching in the GHz range is really quite laughable. That tells me he really does not know what he is talking about and is just making an off the cuff comment or parroting someone similarly unqualified to make a comment.

It is not healthy to put on a pedestal people who simply reinforce your biases without ascertaining if they truly have relevant knowledge in the topic of discussion. You don’t have any reason to place high value in Cyrill Hammer’s knowledge w.r.t. Class-D. Based on the public information, which we can assume we both have equal access to, I don’t perceive anything in his experience set that would make me place high value in his opinion on this matter, unlike say Bruno Putzey who has shown repeatedly, both a high understanding, and an ability to move the technology forward.

needing switching in the GHz range is really quite laughable.

There you go again, he said

"that provide switching frequencies of several MHz or even GHz."

"Even" is the word there sunshine, looking towards the future would be even better to have ghz when technology allows, to get rid of every little trace of switching noise, without any phase shift anywhere near the audio band. Stop being such a putz.

in the GHz range

or even GHz.

You really think these don't say the same?  He clearly said,  "or even GHz".  That is a silly statement that shows a clear lack of understanding of the fundamental way in which Class-D works.


The PUTZ is you George and that is being kind.  Is that the level of name calling YOU need to use when you have absolutely 0 ability to form a proper argument?  That says far more about you than about me.

As Atmasphere has clearly said, and as actual measurements have shown, you don't need multi-MHz and certainly not GHz switching speeds to not have phase shift or switching noise in the audio band.  YOUR knowledge is evidently sorely lacking in this area.  Common sense would tell you that signa-delta DACs don't need to "switch" in the GHz range in order to not have switching noise in audio band. It should tell you that. What that tells you is a mystery.