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 gregfisk

Fishing716, So you have tried different speakers, different amps, different sources and different cables and are still having the same problem. The only thing left is the pre amp. Install a different pre amp in the system and see what happens. Other than than I would try a new house as maybe yours is haunted.