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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
 
It sounds like you have about the same bass energy in both good and bad recordings. It seems to be the character or quality of the bass that is changing
Exactly!
I do have one of the bass plugs installed
csontos
1,311 posts
 
Enter my first post:)
csontos
1,311 posts
 
Or should I say Atmosphere's.
jjrenman
279 posts
 
Have you tried the speakers without the plugs? If so and it is even worse than I'd say we are on the right track. When you add the plugs you are lowering the "Q" of the speaker. Some speaker companies included different lengths of plugs so that the owner could tailor the speaker for the "Q" that works best for his room/amp combination.

The only other possibility is using a whisper fan on the amp so that it never warms up.
fishing716 OP
316 posts
 
No matter what I try the bass changes character about 20 minutes or so into listening.
This happens all day long so I really don't know what to.
The enjoyment of listening is comprimised because I'm waiting for the bass to go out.
Plugs have not solidifed the bass response after many attempts.
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