A solution like you suggest is easy. Purchase a used solid-state amp that has volume controls and one of these 50Hz low-pass filters.
Anthony Gallo Ref 3 - Bass Solutions with Tube Amp
Wondering if anyone out there has come up with solution to "co-drive" the bass module in speaker. I am trying to use CJ-Premier 140 to drive but want to enlist aid of solid state help for the bass.
AG's bass module still looks like it is 3-4 months out.
AG's bass module still looks like it is 3-4 months out.