Amp suggestions

Thanks for all your input, The PSB,s are the Synchrony One B, Parasound P7 pre-amp, Rythmik Audio F-112 sub, VPI Classic One Turntable w/ Lyra Delos and Fosgate Signature pre-amp.

Although the PSB's are bookshelf, I'm satisfied with the mids , percussive bass depth and tightness with the Rythmik dialed in. My issue is how bass guitar is being reproduced. It's hard to explain, but bass notes have an almost annoying , over powering drone that distracts from the rest of the music. Tone controls on the P7 are off. I turned them on once and well you can guess the awful results. Maybe upgrading the amp is not the right step?

Have you ever heard your speakers sound they way you want anywhere else?

You might look at the speakers instead of the amp.

Agree with Bob -- how do you know your sub is really "dialed in?" What method did you use? Does the problem occur with the sub off as well? Perhaps some more advanced room correction will solve the problem and you're done -- not sure what the P7 can do but DSPeaker another option. I'd try that first. This may well be a room issue and you may also try experimenting with some bass traps, which could also help significantly but I'd try the room correction route first as it could help in multiple areas.

Lastly, you don't mention what interconnects/cables you're using. They could also be contributing to the issue although likely not the solution. Best of luck.