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I have no experience with McIntosh so I can't comment.
I owned Bryston 7B SST for several years and I'm a fan of Bryston, but I wonder how much of a sonic change the 4B would be from the A21. Seems like a lateral move to me.
Pass would be my pick from your list. Can you explain your comment related to power and vinyl?
Man, you've got lots of great options at that price level. Here are some other good ones that are for sale here now and are in or below your price range:
Of course there's also the Parasound JC2 if you like your current amp. You really need to tell us what aspects of performance you're looking to improve and which are most important to you to get more specific and useful recommendations. These are all great amps listed here, so especially at this level it largely comes down to personal preferences. Best of luck.
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?
Are you using the bass management in the P7 for integrating the sub? If not, I would suggest you at least try it.
How did you level match the sub to the main speakers?
How large is your room? How loud do you listen? What kinds of music?
At this point, I'd say changing the amp is not going to have any appreciable impact on your issue.
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.