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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
imhififan's avatar
imhififan
2,232 posts
 
If some or All output transistor without good contact to their heat-sink, the output transistor will run very hot. (The amp dosen't feel hot
Can it still be running hot?)
fishing716 OP
316 posts
 
I gave more ventalation by removing the shelf above the amp..
The Bass still left after 1h 20 minutes.
I was listening to "Let it be" & that was my parting words after the sound changed.
csontos
1,311 posts
 
Try the screws that are turned in crooked. Then call Dr. Phil.
maplegrovemusic's avatar
maplegrovemusic
1,113 posts
 
If everything has been swapped out and the one constant still in the system is the speakers ? Then i would be willing to wager it is the speakers ! No ?
fishing716 OP
316 posts
 
Bass returned after waiting 30 minutes.
After about 30 minutes of sounding good it disappated.
Surely something causes deep bass to come & go as it wishes.
I have(3)ideas to try this week:
Electrician is going to check connections
I am borrowing different speaker cables
May put up $1745(demo)& try ps audio p-3 power conditioner with return previlage.
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