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 dayglow

If you had the same problem with the Bryston amp it's very unlikely a power amp issue. Sounds like a power issue. Either line/conditioner or pc. Have you tried switching power cords? Maybe a defective conditioner? Voltage flucuation?