Bass leaves after amp warms up?

"What was the most recent change to your system"?
Nothing,just a different cd player

Musical Fidelity integrated amp & phono preamp
PSB Synchrony Speakers
Rega P5 TT w/dynavector cart
Audioquest cables

What was the most recent change to your system before the missing bass syndrome.

Fishing716: I just looked at the internals of your M6i amps on Google images and I must say for a 200wrms per channel amp the power supply does look a bit on the thin side to what I would like to see, esspecially the amount of storage caps. And a single dual winding transformer for such a high power rated amp should really two tranise of the same size. Suggest you try another amp to see if fixes your problem.

Cheers george

I can't imagine that the amp (unless it's defective) is the problem. Most of the Musical Fidelity stuff is designed and advertised to drive difficult loads. That M6i is supposedly rated at 400 watts into 4 ohms and the poster has said over and over, it never gets warm. Seeing that the poster had the same problem with other amps makes me wonder if we will ever get to the bottom of this.

I'm auditioning Meridian 508.24 cd player with my current setup.It's easy to think this player is just average when dynamics are not working.The sound changed after 15 minutes of being a great player with taut bass to sounding uninspired.
The bottom dropped out before finishing the same track.
Green River/CCR
I'm sure everyone can appreciate how disappointing this phenomema would be.
I will be trying Musical Fidelity M6 250w amp next week.If the problem is not resolved then it's time to part company with PSB.
Which I am very satisfied with when things are working.