I know this is {gasp} a car subwoofer, but I have heard(know) that it is based on a pro driver. This is not the new goofy looking "W" series either. What I need to know is the model number(s) of the the "related" pro driver and also the dimensions of the magnet structure. I have a pdf sheet on the GTI woofer, but it only gives the mounting depth(app 5"), I need to know the magnet diameter as well. I think it is somewhere around 10". The speaker has a cast frame and a 4" edge wound voice coil. They were marked as "1000 watts" on the dust cap, though the RMS was somewhere around 600W.
JBL sold these speakers in the early to mid nineties, and they are some of the best ever for auto sound quality....IMO. They also had a 12" and 18" version. I have heard of a 10" version, but have never seen or verified that. I believe they all used the same magnet/voice coil.
Any help or direction would be greatly appreciated.......