Class D

I don't know what his agenda is, but given he spreads grossly false information and refuses, absolutely refuses to educate himself such that he understands the statements he makes, I don't get it at all.

Come on George several messages above I went into great detail about what EPDR is and how that impacts a Class-D amplifier.  I went into great detail about hard current limiting and explained why the watts don't double at 2ohms. I think I made it simple enough that many people can understand.

Tell me, at this point, who do you think people are going to believe, someone who goes into great detail to explain the process, relates it to actual amplifiers, and uses actual numbers to back up their arguments, or someone who can't do any more than link to an article on Stereophile that they don't even understand?

I will address one other thing on Class-D amplifiers, thermal shutdown.  Class-D amplifiers will often shut down early in amplifier tests when the current load is high and continuous. Why is that?  This is actually a design choice.  The market, at least initially for Class-D, is compact, light weight, efficient amplifiers. Sure, there is a portion of the market who is quite happy with an 80lb monoblock Class-D, but for the most part, that is not the market, even in audiophile land. People want a powerful, efficient, and still compact amplifier. That puts limitations on the size of the heatsink.  Most Class-D amplifiers don't use any more than the small aluminum plate heatsink they are built with.  As well, for good circuit operation, the switching devices are small and surface mount to keep parasitics low. Unlike a linear amp, you can't mount those transistors at the end of inches of wire or PCB trace if you want good performance.  Now sure,  you could design a system, easily, but more expensive, where you could effectively couple to a large heatsink and keep the circuit compact, but that would greatly increase implementation difficulty and cost. I did a prototype once using a heat pipe assembly designed for a PC.

Now I think we all know that the ratio between the peak wattage and the average wattage is quite low. 20:1 or even higher is typical. So even though you may be hitting 500W peaks, 10-20 watts may be your average.  Most Class-D amplifiers, knowing their target market, take this into account. Class-D amplifiers are already efficient, so creating a design that allows very high peaks, does not require a design with high quiescent power draw and dissipation. Since it is not needed, it is not included.  That works great for music, but does not work great when someone is trying to run continuous tones for maximum wattage testing.

Ah, well, I'm starting to have some perspective here. I was unaware - never bothered to care or look - to discover georgehifi is an industry member who sells his own attenuator. Well, NO WONDER there are issues here, and ferocious debates in regard to class D! 

georgehifi, please accept my apology; I thought you were a curmudgeon with a bad attitude toward the industry. You are free, of course, to argue, defend, your product as you see fit.  :) 

I'll recuse myself at this time on further comment on class D in general as compared to other genres of amps. I will have plenty to say about that in the article. I most definitely am checking into an aftermarket fuse for this class D on review. Already spoke with the manufacturer to get info on the value of fuse to acquire.  :) 

I don’t know your DAC, but I hope it has very low output impedance. The NC500 without buffers needs a low impedance source or you will degrade its performance.

Are you blind as well as deaf?

You are free, of course, to argue, defend, your product as you see fit. :)

I don’t have to it speaks for it’s self. Unless ****** like milpai bring for no reason it into a Class-D amplifier thread but to try to cause a fight and you following like a rat up a drain pipe, just like "fusers" do!

I smell another fuser

Good job. Did not know this characteristics of yours. My neighbor also has 2 Vizslas.

People, shillers and manufactures saying Class-D already great and is better than the best linear amps, which it’s far from yet.

Ignore them and move on.

you are a **** why bring that up if you know the answer already.

To make people aware of your agenda and why your keep barking. But your smelling characteristic is something that you should use to search for people with COVID. That way you can stop the spread.

But no need, I go direct into my Class-D’s from my dac

That's what I thought, but wanted to confirm. 

@douglas_schroeder 
You might not be aware that georghifi is also a big A-SO (anti-snake oiler). In fact he might be the biggest A-SO in the industry, from down under. That's how he smells people :-) 

You are free, of course, to argue, defend, your product as you see fit.  :)

It's called fierce arguments that are futile. But I am a bit disappointed in his response to my post. I was expecting him to call me sunshine. I like it when he tries to defend by calling people names. It will get funny from here.