Buy an older MarkBass? MarkBass used to use a silver name plate and normal, black drivers. I used to own an STD 106-6, when I sold it to L&M they thought it was a knock off.
Aside from covering the grill with a flag or cloth something the only thing I can think of is get new speakers.
Carvin LB76 / Dingwall ABZ ! Support Local !
MarkBass SD 800
Epifani UL2-310 / fEARful 1212/6
! Rocking against all gods !