Nominal Basket Diameter 18" 460mm
Nominal Impedance 8 ohm
Nominal Power Handing (AES) 1000W
Continuous Power Handing 2000W
Resonance 30HZ
Usable Frequency Range 30HZ-1KHZ
Sensitivity 97.2 dB
Magnet Weight  126 oz
Voice coil (TIL) 4" 99.2mm
THIELE&SMALL PARAMETERS 
Resonant Frequency fs 30HZ
DC Resistance Re 5 ohm
Mechanical Q Qms 8.8
Electromagnetic Q Qes 0.31
Total Q Qts 0.29
Compliance Equivalent Volume VAS 321.4 Ltr
Mechanical Compliance of Suspension (Cms) 0.13mm/N
BL Product  BL 23.2  T-M
Diaphragm Mass Inc.Airload Mms 196 grams
MOUNTING INFORMATION 
Overall Diameter 465mm
Baffle Hole Diameter 422mm
Mounting Holes Diameter 7mm
Mounting Holes P.C.D 445mm
Depth 206mm
Net Weight 12.75 kg
Shipping Weight 14.75 kg