Hey guys I just joined here but have been a member of another audio forum for a few years. My current set up I have in my expedition is a pioneer f900 head unit, inifinity kappa components in the front doors and kappa 6x9's in the back powered by a alpine 400.4 amp. Right now I have a 12" mach 5 audio ixl powered by a total mobile audio 1000.1. Pretty happy with that set up but have always wanted a big sub so I ordered a 15" FI Bl and just got it today. I get my expedition back tomorrow and then am going to install it. I built a 3.5 cu.ft box that is tuned to 32hz. I am in the process of covering it in truck bed liner and hoping it turns out alright. I joined the forum to hopefully help others and hopefully get some support when I need also.