BAT VK-75SE has fat bass & very soft treble



What can be the reason?
The speaker sensitivity is 87db.
128x128tomer_tsin
Is that 87db at 2.83mv or 1mv? Subtact 3db if the former. How stable is the impedence curve and how low does it dip?
Art
Tsins, How old is this amp? Are you the original owner? Estimated hours of usage? Was this change in character sudden and dramatic or was long and subtle? Have you recently made any changes in your system? Tom