One thing to make maggies have strong bass is to stick something alongside to block the front/rear bass cancellation. with a board alongside each trim strip on thesides, the bass is VERY much stronger.
On my 3.6s music with bass played at say 75dB, exact same musci, same volume etc, with boards six ft tall and 8 inches wide on only the bass side (not on tweeter edge) increases the SPl at seated position by 4 db.
and that is all bass and lower midrange.
So try adding a board to the sides ofthe panel. I can just place one next to, and tape the top edge with packing tape, and it really ROCKS with the bass.
If you want hard rockin' slam, add a temporary 12 inch wide board (as tall as speakers) off the sides. You will not believe the bass coming off that speaker...