[Mike P.]

I found the basic specs on it. I'll model it later on tonight when I get a free moment. Hopefully someone knows what the power handling is.

Sensitivity 91dB
Impedance 4 Ohms
Voice-Coil Diameter 2 inches
Cutout Diameter 14.25 inches
Mounting Depth 6.77 inches
Overall Diameter 15.16 inches
Vas 4.7 cubic feet
Qts 0.44
Fs 28.36Hz
Qes 0.47
Qms 7.35
Xmax 12 mm

 

[Mike P.]

Found it, power handling is 250 watts.

 

[Mike P.]

I had a free moment. It models to 7 cu.ft tuned to 25 hz. 150 watts takes it to Xmax with a high pass filter at 22 hz. Porting would be two 4 inch ports 12.5 inches long.

 

[Mike P.]

Here are the parameters.

http://manuals.harman.com/JBL/CAR/Boxes%20and%20Parameters/GT4-10_f.pdf