2. amps-preamps
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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
 
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
1,275 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
kijanki's avatar
kijanki
3,575 posts
 
Csontos, I did read it but never experienced such big effects from wrong bias. There might be some temperature effect on Mosfets' rds(on) but I cannot imagine why amp would suddenly play fine again after changing source or moving speaker wire. I was asking if the same power cord could be the cause but no answer. I was suggesting trying in different building to isolate the problem, but got no answer to that as well. I'm out.
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