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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 use Musical Fidelity M1 vinl phono stage.
Listed uder my system
fishing716 OP
316 posts
 
Using one speaker,the bass finally recessed after 100 minutes or 3 full LP's.
I'm wondering what to do now..
fishing716 OP
316 posts
 
Generally I switch speaker cable
from one channel of the amp to the other or shut it down & try later/tomorrow.
Considering taking off cover to amp..
Electrician is coming tuesday to check for:
Line sag
Grounding
Phase
Tighten connections

I called cable company & request to borrow a pair of speaker cables:
Analysis Plus biwire also to arrive tuesday.
Thanks for everyone's participation,especially Al!
Welcome any other thoughts
mapman's avatar
mapman
22,248 posts
 
So with one speaker, it took twice as long to show the problem? I'd say that is consistent with the amp running too hot theory. That would assume the amp still got too hot inside but took a fair amount longer to do so due to approximately half the heat being generated as prior, assuming bogh channels running similarly.

I'd really like to know what happens with cover off and/or better ventilation.
fishing716 OP
316 posts
 
Yes but why is the amp running hot if they sell them by the thousands and no report of this problem?
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