Ok in my new f150 ext cab turns out without serious work the p3s I traded for wont fit lol so I need assistance a relatively loud set of 10s or 12s that are less than 120 a piece and have a mounting depth less than 5.25 and airspace wise sealed between .6 and 1 cu ft

thanks for suggestions

dcon are probably too deep. maybe sundown sd would work. are you sure on the depth? 

Yea for an under seat down firing box im prob going to have to run a prefab for the time being til I have time or money for another

After looking up the sd 10 they may fit the bill actually depending on price two 10s would have pretty good output right?

should do alright. not sure what you're reference for output is so who can say its its loud enough. 

Good point well I would assume it would im pretty easy anymore my previous set up was only a dcon 15 on 200 watts so I bet it would do fine. Now as a question for use in multiple generes of music like country rock and rap would a pair of 8s or tens be more appropriate?

10s will be louder than 8s, thats the only difference. 

Dayton HO 10s like small boxes and have pretty small mounting depth.