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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
almarg's avatar
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almarg
9,670 posts
 
Currently just listened 2 complete LP's without losing the bass using just the right speaker connected. I don't know why that is.
Connecting just one speaker will certainly make life easier for the amplifier, and reduce the internal temperatures that it will reach, compared to playing music into two speakers at a similar volume setting.

Regards
-- Al
mapman's avatar
mapman
22,333 posts
 
If the problem occurs in both speakers at same time when it occurs and does not with one, that would tend to indicate that amp/switch/control defect is less likely, but still possible. Definitely supports the amp is overworked due to load and getting too hot theory.
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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.
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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.
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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.
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