winkychevelle 10+ year member
CarAudio.com Veteran
the bl will dig deeper than the q or the ssd. the q is just a good sql sub that gets decently loud, where the ssd is just their groundpounderBL is the louder of the two, I guess. Q has more lows. SSD is a balanced woofer.
btl- comp+/daily depending on model
bl- comp/daily+
ssd- dailly
q- sql
x-entry
ib3-infinite baffle sub