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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
tls49's avatar
tls49
1,351 posts
 
It's been a while since I used stock power chords but will give it a shot.
Did you ever try a different power cord on the amp?
fishing716 OP
316 posts
 
I'll do that now as I lost the good sound again
ddd1
261 posts
 
Lets get back to the electrician visit....

When the electrician visited, did he monitor the power before, during and after you had these issues? If it included during your problems (what would be the point otherwise?), did he not hear the issues too?
ngjockey
1,042 posts
 
Has anybody yet suggested cold solder joints somewhere in the speaker or DC saturated inductors.
fishing716 OP
316 posts
 
When the electrician visited, did he monitor the power before, during and after you had these issues
NO
"did he not hear the issues too"?
No,I had deep bass while he was here
A few minutes after he left the bass changed
I called him back and he returned but was unable to hear the difference
The depth behind the bass notes was clearly diminished to my ears but not to him
So I guess draw what conclusion you seem appropriate..
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