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Bass leaves after amp warms up?

I don't understand-after my Musical Fidelity M6i amp warms up for about an hour I notice the deep bass & kick drum aren't the same.
They sound less musical with loss of weight/depth.The notes are there but the moving of air have left.Sound is has much less impact and boreing.
I had the same problem with Bryston amp so there is no defect with amps nor with the rest of my equipment/
PSB Synchrony one speakers,AQ cables,Bryston CD Player.
My question has anyone heard similar & is there a plausable reason?
fishing716
rrog
1,958 posts
 
"What was the most recent change to your system before the missing bass syndrome?"

The reason I asked this question is because it is easier to backtrack than moving forward and continuing to try new equipment. There is some point where it all began. So, what did you change last? This should give you a clue of where the problem is.
fishing716 OP
316 posts
 
I changed amp but previous two gave same result
I changed from PSB Synchrony II to one with same result
It effects all sources cd,tt,video

I added a phono preamp last but took that out with same results
Ag insider logo xs@2x
drubin
3,274 posts
 
So did you ever NOT have this result? If so, what was the system/environment then?
fishing716 OP
316 posts
 
I've had this result since putting the system together 1 year ago.
wilsynet's avatar
wilsynet
264 posts
 
Have you tried a power regenerator, like the PS Audio P5 or P3 power plant? Wiring could be fine, consistent and clean delivery of power might not be.

Buy from a dealer that accepts returns. If it doesn't do the trick, return it.
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