I found these spec's actually on craigs list lol.
JBL LCS1200W Loud and Clear Series 12" Subwoofer
PRODUCT HAS BEEN DISCONTINUED AND IS NO LONGER FOR SALE
• Titanium-composite woofer cone delivers earth-shattering bass and low-end extension
• Loud + Clear® woofers provide a cost-effective way to add JBL signature bass to your system
• Performance maximized for small sealed and vented boxes (specifications and suggested enclosure sheet provided)
• Butyl surrounds are used to guarantee long-term reliability by rejecting moisture and ultraviolet contamination
Specifications:
Power Handling RMS: 120 Watts
Power Handling Peak: 400 Watts
Frequency Response (± 3dB): 40Hz - 500Hz
Sensitivity: 91dB
Impedance: 4 Ohms
Mounting Depth: 5"
JBL LCS1200W
p.s. what would be a good box for these like i said it's going in a 95 firebird.