I'm running PiCorePlayer on an old RPI (not sure exactly which, but it's only got 2 USB sockets and doesn't have wifi). Output into some old PC speakers works ok, but a bit quiet. So, I'm considering a HiFiBerry amp (presumably the AMP2) and a couple of old bookshelf speakers.
a) will the amp just fit on top of my RPi? Does the HifiBerry Amp include a connecting jobby?
b) do you have a case that will fit them both? Your cases all seem to be for the newer Pi's with 4 USB sockets.
c) does the PSU you sell work for this combination?