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

Showing 1 response by minorl

Go to your friendly neighborhood Radio Shack and buy their relatively inexpensive sound level meter and get the Stereophile Test CD and run it on your system and in your room to see what is happening. You can get on the Stereophile web site and order the test CD for quick delivery. The Sound level meter is really nice also. This will give you a very good indication as to what your system and your room is doing without spending tons of money. you will see if there are holes in your bass response for your system/room.