@sutts - sorry to hear that you sold them, but I'm enjoying mine. There are so many factors between systems including speaker matching with the amp, sources, room, power etc.
The Accuphase C-2450 + A48 preamp/amp combo are a noticeable improvement over the hugely capable Luxman L-595A integrated amp (also class A).
The A-48 is the entry level Accuphase separate amp, but hardly an entry level product. It is plugged into an Accuphase PS-530 power supply.
It is all doing a marvellous job of driving my Verity Audio Arindal speakers (93 dB sensitivity).