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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
atmasphere's avatar
atmasphere
11,851 posts
 
Fishing, break-in does not affect bass in amplifiers so much. It does in speakers though.

If you have not heard the bass come around in a week we can safely assume (as we did before) that it is not the amplifier at fault.
fishing716 OP
316 posts
 
I now have Accustic Arts on the case!
fishing716 OP
316 posts
 
it's Deju vu all over again
mapman's avatar
mapman
22,333 posts
 
"If you have not heard the bass come around in a week we can safely assume (as we did before) that it is not the amplifier at fault."

I have not read anything that indicates this amplifier will be the nth degree in terms of extended and dynamic bass like a good doubling down power amp would be with the PSBs (still those, right?), but it should be quite good otherwise as best I can tell. Amps that an better this one in every way should be much fewer and far between though I would say.
jjrenman
279 posts
 
I apologize if this has been asked already but how loud do you listen? Some speakers Qts (how tight or loose the bass is) can change when the voice coils get hot from playing loud, especially with music that has a lot of deep bass.
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