Do ClassDAudio Amps Have Proper Decay Of Notes?

SCM I have that exact same amp and it is indeed impressive. 

Thanks for your replies everyone. On reflection I think my decay observation was probably wrong judging by reviews I've subsequently read, but there was something weird about my tripath amp that I couldn't put my finger on. Buggered if I know what it was. I'm just hoping the classDAudio amps don't have this quality, since they seem like a good solution for my budget. 

I have one of the small class D amps based on the TPA3116D2 board and I bought it as an experiment. This is a very inexpensive amp so I hardly expect it to be state-of-the-art like some of the larger more expensive class D amps out there. It is my first class D amp and I am certain that class D amps (just like solid state and tubes) have different sonic characteristics based on the manufacturer and the technology used, so I would not attempt to lump them together. So I can only speak for the TPA3116D2 (common and inexpensive) and say the highs sound rolled-off and the timbre/decay of the instruments do not sound realistic. This is when played through high sensitivity horn speakers and comparing it to other much more expensive gear. It sounds polite and pleasing to the ear, but it is not convincing with regards to the instruments. Again this is just an opinion of this one amp and I'm sure there are much better sounding class D out there, you just have to spend more $$ like anything else in this hobby.

Every component & every connection is important in audio if you want realistic playback. Trivializing the power amp-speaker connection will lead to only trouble for you. Neglect it at your peril.....

+1!

Low level detail (which includes decay) is a common problem!

My recommendation is to avoid difficult loads for the amp- with any amplifier including class D, you can see the distortion climb in the specs when you drive lower impedances and you can hear it as a loss of detail and increased harshness. Put another way, if you can reduce distortion in the amp, it will sound smoother and more detailed. Good Luck!

Dont rule out the importance of the amplifier as well as associated componemts as others have mentioned. I have been using Class D amps for.some.time now as the heart of our hybrid amps. In a system, everything matters. I prefer tubes in front of them. If not a preamp then a good tube buffer makes a big difference. Just be careful of the type of load you put on the ClassDaudio amps and stay away from plannars.
Other than that, i am very happy with Class D which is why i chose to use them in some of our products. The Class D Audio products are exceptional for the money.