Specification
Nominal Basket Diameter	18", 457.2mm
Nominal Impedance*	8 ohms
Power Rating**
Watts	650W
Music Program	1300W
Resonance	28Hz
Usable Frequency Range	41Hz - 2.4kHz
Sensitivity***	99dB
Magnet Weight	120 oz.
Gap Height	0.37", 9.53mm
Voice Coil Diameter	3", 76.2mm
Thiele & Small Parameters
Resonant Frequency (fs)	28Hz
DC Resistance (Re)	6.29
Coil Inductance (Le)	1.9mH
Mechanical Q (Qms)	8.28
Electromagnetic Q (Qes)	0.3
Total Q (Qts)	0.29
Compliance Equivalent Volume (Vas)	441.2 liters / 15.6 cu.ft.
Peak Diaphragm Displacement Volume (Vd)	695cc
Mechanical Compliance of Suspension (Cms)	0.24mm/N
BL Product (BL)	22.1 T-M
Diaphragm Mass Inc. Airload (MMs)	130 grams
Efficiency Bandwidth Product (EBP)	93
Maximum Linear Excursion (Xmax)	6.1mm
Surface Area of Cone (Sd)	1140 cm2
Maximum Mechanical Limit (Xlim)	18mm
Mounting Information
Recommended Enclosure Volume
Sealed	N/a
Vented	93-212 liters / 3.3-7.5 cu.ft.
Driver Volume Displaced	403.9 cu.in. / 6.62 liters
Overall Diameter	18", 457.2mm
Baffle Hole Diameter	16.56", 420.5mm
Front Sealing Gasket	Fitted as standard
Rear Sealing Gasket	Fitted as standard
Mounting Holes Diameter	0.28", 7.1mm
Mounting Holes B.C.D.	17.25", 438.2mm
Depth	8.15", 207mm
Net Weight	24.5 lbs, 11.1 kg
Shipping Weight	28.1 lbs, 12.8 kgs
Materials of Construction
Coil Construction	Copper voice coil
Coil Former	Polyimide former
Magnet Composition	Ferrite magnet
Core Details	Vented and extended core
Basket Materials	Die-cast aluminum basket
Cone Composition	Paper Cone
Cone Edge Composition	Cloth cone edge
Dust Cap Composition	Solid composition paper dust cap

 

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