For the bass box for my fullrange-driver project, I am interested in using 4 of the Madisound Sledgehammer 5.25" woofers per side. These woofers offer a fairly low Fs and deep frequency response, down to 49 Hz. These will be in a simple ported box, and be run passive. Some time in the distant future, I might add a music-type 12" subwoofer to reach really low. This will not be a HT system, but it will be a music system. Bose (eww) makes a bass module (model MB4) for their MA12 modular line array. It also uses 4 5.25" woofers (which is dumb for PA) and loads of EQ. I just want to know if I'm out of my mind for using these 4 5.25" woofers. This is just for the sake of maintaining a thin profile, but without using side-firing woofers. 5.25" woofers allow me to keep the width of the baffle to 7". P.S.: I'm not going to step out of line by calling these "subwoofers".