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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
 
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.
csontos
1,311 posts
 
Yes. If I'm not mistaken, the PS Audio P-3 connects one lead to the right temple and the other to the left. Be very careful in plugging in the ground:)
rrog
1,958 posts
 
Should I ask where you plug in the ground?
larryi
4,012 posts
 
I will preface my comments by saying I have not read everything said above, so I may be covering ground that has been rehashed to death. If the problem persists after certain components have been switched out, it lies with those that have not been switched out. If it happens with different sources, it is probably not the source components. If it happens with different sources, or when a source has been switched out, or with different components in the amplification chain, that really leaves the speakers to be suspect. If one overheats speakers the sound does change dramatically. If, for example the woofer voice coil gets too hot, resistance will shoot up and the speaker will sound lighter in bass. The crossover components can also heat up and this will affect the sound dramatically as well-component values will shift and change crossover points, filter characteristics, etc. and could lead to the loss of bass.

Such obvious change in sonic characteristics, if due to overheating of the speaker, constitutes pretty rough treatment of the speakers. Perhaps something designed to produce higher volume is needed for this particular application.
mapman's avatar
mapman
22,248 posts
 
Does the dealer you bought from still sell the PSBs?

Maybe go there, talk to the dealer, and listen to your speakers there off a few different amps if possible. Maybe even take yours in and see what happens there off various amps if possible. Maybe even take the amp in to test out. See if same thing happens there.
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