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BIG BEN
A very big, clean and warm British sound. A somewhat throaty tone with fat bass and smooth highs

SPECIFICATION
Nominal Basket Diameter 15", 381mm
Nominal Impedance* 8 ohms
Power Rating
Watts 225W
Music Program
Resonance 85Hz
Usable Frequency Range 70Hz-3.5kHz
Sensitivity*** 101.5
Magnet Weight 56 oz.
Gap Height 0.375", 9.53mm
Voice Coil Diameter 2.5", 63.5mm

THIELE & SMALL PARAMETERS
Resonant Frequency (fs) 85Hz
DC Resistance (Re) 6.06
Coil Inductance (Le) 0.51mH
Mechanical Q (Qms) 10.63
Electromagnetic Q (Qes) 1.04
Total Q (Qts) 0.94
Compliance Equivalent Volume (Vas) 77.7 liters / 2.74 cu.ft.
Mechanical Compliance of Suspension (Cms) 0.08mm/N
BL Product (BL) 12.1 T-M
Diaphram Mass inc. Airload (Mms) 47 grams
Efficiency Bandwidth Product (EBP) 82
Maximum Linear Excursion (Xmax) 0.0mm
Surface Area of Cone (Sd) 856.3 cm2
Maximum Mechanical Limit (Xlim)

MOUNTING INFORMATION
Recommended Enclosure
Sealed
Vented Acceptable
Overall Diameter 15.13", 384.2mm
Baffle Hole Diameter 13.8", 350.5mm
Front Sealing Gasket fitted as standard
Rear Sealing Gasket fitted as standard
Mounting Holes Diameter 0.25", 6.4mm
Mounting Holes B.C. D. 14.56", 369.9mm
Depth 6.1", 155mm
Net Weight 12.6 lbs., 5.7 kg
Shipping Weight 14.9 lbs., 6.8 kg

MATERIALS OF CONSTRUCTION
Coil Construction Copper voice coil
Coil Former Polyimide former
Magnet Composition Ferrite magnet
Core Details Non-vented core
Basket Materials Pressed steel basket
Cone Composition Paper Cone
Cone Edge Composition Paper cone edge
Dustcap Composition Zurette dust cap