Has anyone tried an amp from Class D Audio?

I have built and auditioned many of the Class D Audio amplifiers. They are a very neutral amp. If you want a bit of warmth in the mix, a nice tube buffer makes a work of difference. A buffer also helps putting a Class D amp in the system in regards to impedance as the Class D amps have a low iinput impedance and a buffer can have a very low output impedance.

The SDS-254 should not be a prpoblem as it has a 47K input impedance but some of the others are as low as 7K. This is also the best amp they offer in my opinion. Plenty of power, balanced inputs possible and easily handles 4 ohm loads. This module is the baseline for some hybrid amps we have designed.
A little tweaking and you really can have an exceptional piece for very litte outlay of cash.

If you are going to build your own based on one of their modules, I would recommend setting it up forst with the attenuators that come with it, measuring the resistance where it performs best for your system and then installing a resistor network in place of the attenuators (or simply leave the attenuators in for that matter. This can greatly reduce any residual noise due to the high gain of the amps.

Hey Spencer
I think you will find the 470's quite pleasing. I have a few of the smaller powered version of these same amps and have been running them for a couple years as they are the platform of our Hybrid power amps.
Just spoke to Tom today about the 470's and will certainly be using these higher power versions as well.
Should have no problem with those Timepieces (nice to know you still have them).
Be well and keep us posted on what you decide to go with. You are welcome to contact me if you want to hear more of my thoughts on them. If you don't still have my email, you can message me through A-gon.