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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
almarg's avatar
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almarg
9,670 posts
 
Did the Synchrony Twos exhibit the same symptoms as the Ones?
Could PSB being 4ohm possibly be the reason?
As Mapman asked earlier, what models were the Bryston amps?

Regards,
-- Al
fishing716 OP
316 posts
 
Yes Synchrony II' exhibited same symptoms as current one's

I had Bryston B60R SST & B135 SST
Both fine sounding amps

Thought I needed more power so got MF M6i 200 watts
csontos
1,311 posts
 
Al, Ralph, or Kijanki, have you read my previous post?
ojgalli
165 posts
 
One more possibility: dynamic compression from overheated woofer voice coils.
fishing716 OP
316 posts
 
On two consecutive set of speakers?
Others would have found problems if this was prevelant in PSB speakers.My hearing is very good but the drop in dynamics is night & day.
PSB Synchrony one' speakers are rated top 25
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