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

After 300 posts and all of the logical advice that's been given, I don't think that you're accepting the three apparent possible reasons for your dissatisfaction.

1. Power - you say that an electrician says that your home's wiring is fine. That's not what we're saying. The power draw on your grid has nothing to do with the wiring in your home.

2. Acoustical treatments and speaker position - maybe you need to seriously look into your room and system's setup.

3. Disappearing bass - if you left your components on all of the time you would actually hear what they sound like as the manufacturer intended. If you like the sound when the system is cold but not warmed up, and it's not the power draw, the room's acoustics or the speaker placement, maybe you just don't like the sound of your system and need to change components.

It seems like you have your mind set on one sight, and are not being open to an answer and solution that you don't want to hear or want it to be.

Chuck
I have request to borrow Musical Fidelity M6 250 dedicated amplifer from my dealer.That way I'll know if the amp or speakers need to be changed.
Hope he will lend it to me,I'll report back.
Did anyone listen to the 2 versions of Respect yourself by Staple singers that I set out?
You would hear one version has the right groove in the bass the other doesen't at all.

I had a Musical Fidelity A308cr power amp for a few years and it was excellent. If the M6 is anything like the A308cr, I don't think that's the problem.

If it is, this is the Class D amp that I use and it will take a hold of your speakers and tell them what to do: http://app.audiogon.com/listings/solid-state-spectron-audio-musician-iii-mk2-w-free-v-cap-upgarde-new-sealed-2013-04-03-amplifiers-91325 Tell them that you want it without the V-Cap upgrade and see if you can't get it $3,500.00.

You may want to borrow someone's CD player that is better than yours and see if that's not a problem. If it is, relax and wait until you can afford a better one.

Chuck