Okay guys, I have done quite some reading on the subject now and it appears that the vast majority of class D amps seem to be of the analog variety, but both do exist.
The reason analog is favored seems to be the feedback loop used for error correction. This is much harder to realize in software/DSP then in the analog world. This is true to such an extent that many class D amps with DPS in them will convert the analog input to digital, run the DSP on it, and then convert the digital back to analog to send into the comparator stage.
Doing the error correction in the digital world involves analog to digital conversion of the output signal (high voltage) and lots of maths on the processor. This creates delay in the error correction signal. That's the killer.
Originally Posted by BassThatHz
Save your money and brain-power by not thinking about this topic any further...
I'll save the money alright. I will never save brainpower!
This whole excercise left me knowing more then before I started, and that's what it's all about.
Big thanks for educating me to all who contributed to this thread!
That leaves me with the question of which amplifier to get. I have been looking at Behringer, Crown and QSC. None of them seem to spec frequency response below 20Hz. I would like 2x 800W+ RMS into 4 ohms, measured, not in the specs, specs are mostly bull**** it seems. DSP is also needed because I will be using 2 subs at different distances.
What do you use for subs?