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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
mapman's avatar
mapman
22,232 posts
 
Hmm, well I thought i read that Yamaha model to be Class D, but maybe not.

Maybe this amp will do better than the last one. I tend to like most Yamaha amps I have heard, but have not heard that one. I hope it works out.
lowrider57's avatar
lowrider57
5,417 posts
 
Fishing ... Class D as compared to class A, AB amps....

http://en.wikipedia.org/wiki/Class-D_amplifier
srwooten's avatar
srwooten
694 posts
 
testing testing
fishing716 OP
316 posts
 
Can anyone recommend Yamaha paired w/PSB Synchrony one's or is Musical Fidelity pre/prx much better choice?
lowrider57's avatar
lowrider57
5,417 posts
 
Don't know, but again the issue of of output power comes up. You need an amp that doubles down it's power from an 8 ohm load to 4 ohms. The Yamaha does not. (Remember the impedance curve of the Synch One drops below 4 ohms).
That's the solution to drive those speakers IMO.

Look for this topic in the earlier comments. Go looking for Almarg's postings....and Dan Wright's info.
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