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

Csontos and Ralph,

So, if I'm understanding what you're saying, some amps sound better cold than when they're warmed up? If that is the case, anyway it goes, it seems that a person needs to leave the amp on and accept the way it sounds warm.

That is, unless you want to listen for an hour, turn it off, let it get cold again and then turn it back on and listen for another hour. That just doesn't seem to be an ideal way to listen to your system.

If a warm amp is at least consistent even if it doesn't sound as good, at least you have a known sound that you can count on.

Am I thinking wrong?

Chuck
You got it! Unless of course you decide to either set up the amp optimally yourself or have it done if you're too squeamish. If you do, you won't be complaining about the issue I brought up and you can go ahead and leave it on 24/7.
I've been following this OP with fascination. I'm going to record my stereo too. ;>') Kidding.

Bottom line: should Fishing simply turn the volume up to get to the sweet spot?? If so, 300+ posts later, it sounds like a pretty simple solution. I surmise that Fishing won't need Zeros. Just a remote control to increase gain by roughly 3 db after warm up.

It's actaully quite interesting to me. By contrast, tube amps usually sound better after warm up. Is this a common problem with most SS amps? If so, I wonder why more folks don't raise the same issue??
The absolute difference is the "good" version has imputus,groove,the kick is firm w/deep bass that moves air.
All these contribute to an effect that stimulates the senses and you are rewarded with a connection to the music.When these attributes are muted the result is sound with no emotional resonance.

All this speculation has failed to resolve one desire:
To have the full dynamics I hear in my system stay without playing hide & seek/
On a positive note my dealer & friend @Audio Salon has agreed to lend a dedicated amp for me to compare.
Musical Fidelity M6 power amp/250 watts