OP what happens with the tone control. Set flat it does that?
Are you using a silver clad wire? for speaker ICs?, Again are you using silver clad wire, in you IC between source and Pre, and pre amp to amp?.. All of those can add a lot of "BOIL to the mix" Right over your head, with 8 foot lids... Treat the heck out of it.. Rake the speakers 3-10 degrees. BACK, get the highs further over your head... Make a sticky foam filter for the front of the tweeter, sides, top. ALL low dollar checks, even the IC, use some less expensive copper... look out for silver right now... Gold terminals.
Regards
Are you using a silver clad wire? for speaker ICs?, Again are you using silver clad wire, in you IC between source and Pre, and pre amp to amp?.. All of those can add a lot of "BOIL to the mix" Right over your head, with 8 foot lids... Treat the heck out of it.. Rake the speakers 3-10 degrees. BACK, get the highs further over your head... Make a sticky foam filter for the front of the tweeter, sides, top. ALL low dollar checks, even the IC, use some less expensive copper... look out for silver right now... Gold terminals.
Regards