What would you build with these Drivers

no longer available but i have a pair. beautiful mid bass and very well build




C15-500LF

WOOFER MODEL C15-500LF
Specifications
Nominal Basket Diameter 15"
Impedance 8 ohms
RMS Power Rating 500 Watts
Program Power 1000 Watts 
Frequency Response 30Hz - 1.2kHz
Sensitivity (1W/1m) 97dB
Voice Coil Diameter 4" / 101.6mm
Mounting Information
Overall Diameter 15.16" / 385mm
Bolt Circle Diameter 14.57" / 370mm
Baffle Cutout Diameter 13.9" / 353mm
No. Of Mounting Holes 8
Overall Depth 6.3" / 160.2mm
Net Weight 22.73 lb. / 10.33 kg.
Materials
Basket Die Cast Aluminum
Cone Paper
Surround Treated Cloth
Voice Coil Copper Clad Aluminum Wire
Magnet Ferrite
Former Material Glass Fiber
Terminal Type Gold Plated Push
Thiele-Small Parameters
Resonant Frequency (fs) 39 Hz
Impedance (Re) 5.2 ohms
Coil Inductance (Le) 1.7 mH
Mechanical Q (Qms) 3.76
Electrical Factor (Qes) .28
Total Q (Qts) .26
Comp. Equivelant Vol. (Vas) 5.83 ft3 / 164.99 Liters
Effective Surface Area (Sd) .085 m2
Voice Coil Overhang (Xmax) 5.0 mm
Reference Efficiency 3.5%