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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
atmasphere's avatar
atmasphere
11,894 posts
 
Fishing, Have you tried putting a fan on the amplifier?

Based on all that we have discussed, it does seem that heat plays a huge role. The fan should be able to cool the amp's heatsinks.
csontos
1,311 posts
 
Or even just with the top cover off. Better yet, two sets of recordings should be done; with and without added cooling. This could end up being a very fruitful case study on due diligence by ss amp manufacturers. No wonder there's separate tube and ss camps. Tubes and mosfets do after all share some similarities.
fishing716 OP
316 posts
 
I Listened to my system all morning and discovered what is changing in addition to the bass is overall dynamics & timing..When the sound changes the music seems to sag and it's hard to get into the music.
Like getting on an escalator and "riding" with the music/The second version blocks or prevents following the music in the same way.
Like being "out of sync"
So Weird
rrog
1,958 posts
 
That's what happens when the midbass is down in level.
fishing716 OP
316 posts
 
How does midbass go down in level?
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