Do ClassDAudio Amps Have Proper Decay Of Notes?

@auxinput   If that's really the case, the problem is that the switching frequency is too low because its only at the frequencies of the digital codices. And I can tell you from having designed Class D amps that no DAC out there can drive the outputs directly- so there is likely a level shifter and driver circuit as well. Since the codices are such low frequency, a converter of some sort would have to be employed, along with some sort of computer control (like @ostensible mentioned earlier) to switch from one algorithm to the other. Otherwise the distortion of the amp would be quite high; funny that distortion can be low with digital but if you switch at that frequency distortion is unacceptable.


That's why I don't think there is a true digital amplifier out there.

Everyone: There’s a bit of confusion here.

The OP is only concerned about products from one given manufacturer, namely Class D Audio out of Anaheim, CA.

The OP could not care less about opinions about class D topology for amplifiers.

^^ Yes, that was certainly not obvious since buying a class D audio kit is pretty easy to do. It seems that a company name like that would cause a lot of confusion in the marketplace. It probably can't be trademarked.

As for NAD: I believe they started to move away from the DirectDigital idea, and forward to a new hybrid technology which in part is based on Hypex. 

The NAD D3020 is one such hybrid. The current master series multi-channel HT amp is purely Hypex. 

Best,

E

Ignore my last post. NAD is apparently using the hybrid in the D 3020 but the Direct Digital approach in the D 7050.

I own the 3020, and it sounds really good. I have not heard the 7050, but I will say I have never heard a PWM amplifier I liked. I have heard many Class D amps I liked though. :) 

Best,

Erik