well after lookin through things i decided on fi.... probably a hifonics amp....i dont know if i want two 15's or 18's...what shape of box....ported or not...which would sound better...i know i have to wait with the box thing b/c i will build it myself and will need measurements ... i think i will go with 15's.... but should i go with ssd, q, or bl??...even though i say i want to go with fi...i keep going back makin sure i make a good decision....im looking for some amazing sound quality subs that also hit decent...