Interesting, wanna rebuild mine if I get em. They have the chrome finish baskets by the way....the black frame and chrome frame motors are different. also, the motor on the 15" black frame is almost twice the size of the 12" motor. I own a speaker company, i rebuilt 2 PBX 15's with some spl parts, and they were louder than my APX subs, and matched my 9515's. Every time i buy a PBX, the first thing i do is rebuild it.
all in all, they are a great woofer, i had 9 of them in a wall in my van, bass raced a 155.7 on the TL in 2004