D Class amps are great
and are no longer "mono channel for bass" only anymore.
The tiny Xtant 1.1i mono amp I have in my Indy for the sub is an early D Class amp.
But they can create some problems with RFI because of the circuits and switching design.
I bought a beautiful Soundstream Picasso Nano PN4.320D 4-channel amplifier for my Honda Goldwing motorcycle.
4.5"x7"long x1.5"high http://soundstream.com/product/pn4-320d/
I mounted this amplifier in the fiberglass/plastic trunk
which also has the mast antennas mounted to it.
Because of the near proximity between the two, the RFI produced by the amp wiped out half my FM channels.
I tried relocating grounds and installing ferrite chokes with no solution. So I had to take it out. (still have it in the box)This would not have been a problem in a steel chassis car
mounted in the trunk or under a seat away from the antenna.
I took it out and got hold of an Alpine KTP-445U (a bit less power than Nano) and about the same as the Clarion mentioned.
This is also a D class amplifier, but the design of the circuits didn't create any FM interference and works great on the motorcycle.
2.5" x7.5"long x1.5"high http://alpine-usa.com/product/view/ktp-445u
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[This message has been edited by fierosound (edited 01-05-2016).]