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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
mapman's avatar
mapman
22,333 posts
 
BTW testing with just one speaker in lieu of others to test with was a good call! Gotta remember that one.
mapman's avatar
mapman
22,333 posts
 
Can you take the cover off and test as Al suggested?

If that helps, a good external + quiet cooling fan might help. Or if you have any fan that could be applied, just try that. ANything to help lower the internal temperature and see what happens.
mapman's avatar
mapman
22,333 posts
 
BTW, if you can prove via testing that cooling the amp helps the sound quality, that would add leverage for you with your dealer and MF to get them to perhaps offer a trade or other solution to help you get better results with the PSBs. Especially since MF has told you what you have should be fine.
lowrider57's avatar
lowrider57
5,417 posts
 
Agree...take the cover off, it's the only thing you haven't tried. Put your trust in Al and Mapman.
fishing716 OP
316 posts
 
I don't think I'm good at taking the cover off.
I'll have a look at it
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