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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
22,102 posts
 
You might also try a different pair of easy to drive speakers as a test and see what happens there.
fishing716 OP
316 posts
 
The problems are exactly the same with all 3 amps
(2)bryston & Musical Fidelity
Deep bass for about 1 hr
Longest it lasted was 3 days then sound changes with loss of defination.

I seem to notice it's easier to retrieve deep bass with just one speaker connected rather than both.
(Either side)
Sill fades away after apx. 1 hr
mapman's avatar
mapman
22,102 posts
 
Do you have any other speakers around? What happens with them? Results would help determine if speaker/amp match or defect in amp is an issue.
fishing716 OP
316 posts
 
I only have these speakers

The bass is firm & lasts longer with just one speaker connected.Eventually leaves but right now it is working for about 30 minutes
Listening to Chicago V on Rega P5 TT w/dynavector.
I would keep this sound w/one speaker & loss of half information.
But soon it will leave.
I am monitering the situation
fishing716 OP
316 posts
 
Please let me know if anyone notices contradictions in my observations.
As I've tried everything
Could it be reasonable that loss of deep bass is normal?
Perhaps I need to augment my system with a subwoofer.
I feel bass is adequate when I have it
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