First thing, its a 66 mustang, the trunk is small and i need a lot of the space in there for amp installation so i cant run twin woofers sadly, atleast not easily and i dont like doing things that are a huge giant pain in the ass a 12 inch woofer however should fit easily, depth shouldnt matter either my budget:anything under 400, i dont want to go over that unless its like 405, 410, etc. I cant demo much of anything, there seem to be no decent shops near by but this is what I want from my sub: able to extend low with little to no distortion, low as in 20hz. I also need to get decent spl levels out of it, this is my first full system so id probably be more easily impressed than you guys of course but it needs to have enough impact to bring attention. (in the car not out ) know what i mean? i was thinking IDMAX but not sure what else there is to choose from not sure what H2s sound like, what about w6s? not sure about sound splinter either, their supreme drivers are a bit out of my range and not sure if id get what im looking for out of their mid-level choice. oh and im going sealed btw indefinately. expect pics of project progress in a month or so, have a couple more things to do before i get to begin car audio stuff but everything is planned except what sub to get.