18 in. Paper/Cloth 109 oz. 600 watts Cast Frame

Nominal Basket Diameter 
Impedance
Power Rating
Resonance
Usable Frequency Range
Sensitivity
Magnet Weight
Gap Height
Voice Coil Diameter   

Mounting Information 
Recommended Enclosure Volume*    (vented)
   *The enclosure volume printed in the catalog is a misprint.
Overall Diameter    
Baffle Hole Diameter  
Front Sealing Gasket
Rear Sealing Gasket 
Mounting Holes Diameter 
Mounting Holes B.C.D. 
Depth
Shipping Weight        

Thiele-Small Parameters
Resonant Frequency (fs)
Impedance (Re)   
Coil Inductance (Le)
Electromagnetic Q (Qes)
Mechanical Q (Qms)
Total Q (Qts)
Compliance Equivalent Volume (Vas)

Peak Diaphragm Displacement Volume (Vd)
Mechanical Compliance of Suspension (Cms)
BL Product (BL)
Diaphragm Mass inc. Airload (Mms)
Equiv. Resistance of Mechanical 
          Suspension Loss (Rms)
Efficiency Bandwidth Product (EBP)
Voice Coil Overhang (Xmax)
Surface Area of Cone (Sd)
Impedance at Resonance (Zmax)
Maximum Mechanical Limit (Xmech)

18", 457.2mm
4 ohms* or 8 ohms
800Wrms
28Hz
25Hz - 2kHz
click here for guide
109oz.
 0.375", 9.52mm
4.0", 101.6mm

 142 - 170 liters
 5 - 6 cu. ft.
18", 457.2mm
16.56", 420mm
fitted as standard
fitted as standard
0.25", 6.4mm
17.25", 438.2mm
8.15", 207mm
30lbs., 13.6 kg.

28Hz
5.1 ohms
1.67mH
0.25
5.53
0.24
354 liters
12.49 cu. ft.
635cc
0.19mm/N
25 T-M
171 grams

5.46N*sec/M
114
4.8mm
1159cm²
97 ohms
32.0mm