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
Hah. Problem solved!! I was right. Mr. Fishing.. confirmed it -- ghosts. Your system needs an exorcism. I'm running a 2 for 1 special this week. Send me an e mail and we'll discuss the pricing. So is Amityville on Long Island?
I have an observation:
When I use Marantz Learning remote to press mute on the amp.Many instances that's when I notice the sound changed for the worse.
Is that "remotely" possible?
It's possible that you're still young enough that your hearing extends up this high and you're bothered by the spike

I'm 53 years old
So you use the learning remote to mute the system, and then what? Does the sound change for the worse when you unmute it?