Website doesn't show. I have saved the old specs for a m3? I believe. Hopefully it helps.
Here are the specs I have:
18"
Mounting Depth11.5"
Mounting Hole Diameter16.75"
Outside Driver Diameter18.5"
Motor Width9.84"
Weight85lbs
VC Diameter4"
Displacement.26³ ft
Magnet Weight80lbs
Power Handling RMS/Peak4500/9000
Impedance (Ohm)D.7/D1/D1.4/D2
Sd1217cm²
Vas67.02 liters
Cms0.0325mm/n
Mms588.52g
Fs36.4
BL36.25
Re4.02 Ohm
Le7.5mH
Qms22.43
Qes0.416
Qts0.409
Xmax31.25 mm
Ref SPL @ 1 watt90.7dB
Suggested SealedN/A
Suggested Ported 6³ ft