I haven't seen this on FRF and saw a bunch of threads on this on F150Forum so thought I'd throw this out there. Sound Ordnance.
From what I can tell after reading too much... they can add some punch to the system for rock and similar music but are not going to be good for really deep bass say like below 40hz on some types of electronic music. Also not a really high performance high output system for db competitions. Some folks have used 2 of them...
But they can fit totally behind the rear seats.
Sound Ordnance B-8PTD 125-watt compact powered subwoofer at Crutchfield.com
From what I can tell after reading too much... they can add some punch to the system for rock and similar music but are not going to be good for really deep bass say like below 40hz on some types of electronic music. Also not a really high performance high output system for db competitions. Some folks have used 2 of them...
But they can fit totally behind the rear seats.
Sound Ordnance B-8PTD 125-watt compact powered subwoofer at Crutchfield.com