heres the info i got on them (12's)
Magnet: 160 oz. Double stacked Ferrite magnets
Frame: 5 spoke Die-cast aluminum basket
Cone: Reinforced aluminum curvilinear
Surround: Oversized Buytl Rubber
Spider: 2 Flat ultra excursion
Program (conservative)
T Yoke: Industrial Chromed Hex bolt retained,
Bumped and Vented
Double damper magnetic motor assembly
Cooling: Double Vented (T Yoke and Motor Side vents)
Voice Coils: 4 Layer Dual 4 Ohm High Temperature black Aluminum
Voice Coil Diameter: 2.2"
Nominal impedance: 4 ohms / per coil
DC resistance (Re): 3.2 ohms each coil
Frequency range: 20 Hz-1.1 kHz
Fs:30 Hz
QTS:.526
QES:.614
QMS:7.698
VAS:56L
SD:.0491M
SPL:90 dB 1W/1m
Xmax:16mm
Subwoofer Specifications:
Subwoofer Size: 12"
Impedance: 4 ohms
Dual Voice Coil: Yes
Peak Power Handling: 1000 watts
RMS Power Handling: 500 watts
Surround Material: Butyl Rubber
Sealed Box Volume: N/A
Ported Box Volume: N/A
Sensitivity: 90 dB
Frequency Response: N/A
Top Mount Depth: 6-3/10"
Cutout Diameter: 11-1/10"
Warranty: 1-year Manufacturer's