Hello again Tim -
Reading your follow-up comments makes me think that the problem may not be clipping or specifically power-related after all. Apparently your LP listening via the PV5 is "warm and beautiful," and this suggests that the amp and speakers are working well together under some circumstances. My own experience tells me that this combination should work well up to moderate volume levels and even somewhat beyond. If you want to really crank it, you may still want to look into upgrading or changing the amp, but you should be able to get very satisfying sound at anything less than high SPL. So it may be that some other factors are causing your problems, and other responses here have provided some good options to look into. It still seems to me that you are reacting to distortion of some sort, or what I might call "glare." But if your LP listening is enjoyable, why are you having so much trouble with CDs? Sure, I would expect some difference, but to jump from "good" to "bad" seems odd. Some experimentation is called for, and it looks like you are on the case. Speaker setup and room treatment are fundamentally important, as others here have already suggested. Trying other cables may tell you something helpful, but if your LP sound is good, then the cables seem to be working well in some sense. You might try another CD player to give you some idea of what the Arcam is contributing. Good luck in the search, and have fun!
You can contact me via my website for more info on the upgrade options - thanks.
Best regards,
Steve McCormack
SMc Audio