Nominal Specifications
Nominal Diameter 18“, 460 mm
Overall Diameter 18.11“, 460 mm
Bolt Circle Diameter 17.32“, 440 mm
Baffle Cutout Diameter 16.61“, 422 mm
Depth 7.95“, 202 mm
Flange and Gasket Thickness 0.55“, 13.9 mm
Electrical Specifications
Minimum Impedance 6.6 Ohm
Nominal Impedance 8 Ohm
Nominal Power Handling*** 1,000 W
Maximum Power Handling**** 2,000 W
Sensitivity (1W/1m) 99 dB
Frequency Range 35 – 1600 Hz
Voice Coil Diameter 4“, 100 mm
Winding Material Copper
Former Material Glass Fiber
Winding Depth 0.9“, 23 mm
Magnetic Gap Depth 0.47“, 12 mm
Flux Density 1.3 T
THIELE & SMALL Parameters
Resonant Frequency (fs) 35 Hz
DC Resistance (Re) 5.4 Ohm
BL Product (BL) 27.2 N/A
Diaphragm Mass inc. Airload (Mms) 182 grams
Mechanical Compliance of Suspension (Cms) 0.11 mm/N
Rms 4.1 Kg/s
Electromagnetic Q (Qes) 0.29
Mechanical Q (Qms) 9.74
Total Q (Qts) 0.28
Compliance Equivalent Volume (Vas) 7.74 ft³, 219.2 dm³
Surface Area of Cone (Sd) 180.7“², 1,166 cm²
Maximum Linear Excursion (Xmax)* 9.5 mm
Xdamage** 17.5 mm
Coil Inductance (Le) 1.7 mH
Diaphragm mass (Mmd) 159.5 g
Eta Zero 3.1 %
Notes
*Xmax = [(winding depth – magnetic gap depth) / 2] + (magnetic gap depth / 3)
**Maximum excursion before permanent damage
***2 Hours Test According to AES 2-1984 Rev. 2003
****Maximum power is defined as 3dB greater than nominal power
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