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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
b_limo's avatar
b_limo
2,277 posts
 
Fishing, is it related to the time of day? Early mornings and late nights it sounds good? Middle of the day, it sounds bad? I've noticed my system sounds better late at night, around 9pm and later.

Also, are you able to demo another amp from a local hifi shop?

If none of that works, maybe you should sell me the psb's at a highly discounted rate, since they're obviously defective ;-)
fishing716 OP
316 posts
 
Since having the PSB all 3 amps have given the same results with exact same symptoms.
Irony is I like the PSB Synchrony sound
I borrowed Thiels for a very brief period and found them to be bright.Bass not being consistant was inconclusive.

Currently just listened 2 complete LP's without losing the bass using just the right speaker connected.
I don't know why that is
I'm currently monitering this effect & duration
fishing716 OP
316 posts
 
Timeing & pace seem much better when lower bass is cooperating.
almarg's avatar
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almarg
9,670 posts
 
Currently just listened 2 complete LP's without losing the bass using just the right speaker connected. I don't know why that is.
Connecting just one speaker will certainly make life easier for the amplifier, and reduce the internal temperatures that it will reach, compared to playing music into two speakers at a similar volume setting.

Regards
-- Al
mapman's avatar
mapman
22,374 posts
 
If the problem occurs in both speakers at same time when it occurs and does not with one, that would tend to indicate that amp/switch/control defect is less likely, but still possible. Definitely supports the amp is overworked due to load and getting too hot theory.
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