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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
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
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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.
rrog
1,958 posts
 
"I've had this result since putting the system together 1 year ago."

The plot thickens.

I'm sticking with my original assessment. There is nothing wrong with your system other than you don't like it after it warms up. You want a richer tonal balance. How you get there is up to you. Try Vandersteens, Sonus Faber or any other speaker that is on the warm side.
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