i really have no exposure to any sq and sql subs. dont have many people near here that are into car audio. my next setup ill prolly be running 2 18s or 4 12s or something like that, and ill prolly be getting 2 AQ 3500d's. all ive been looking into are the high power spl drivers, and i havent really looked into any sq or sql drivers. and when i just now thought of it, i dont really know of that many lol. so im thinking if i do 2 18s, theyll need to be able to handle 2k - 3k rms each daily, or if i do 4 12s, be able to take 1500ish rms daily. throw some suggestions at me, im open to pretty much anything.