Transducer Size (Millimeters)457.2
DC Resistance3.67
Resonant Frequency27.8
Half Space Sensitivity94.62
Rated Noise Power800
Test Spectrum Bandwidth40Hz ~400 Hz

Transducer Size (Millimeters) 457.2
DC Resistance 3.67 Ω±5.0%
Resonant Frequency 27.8 Hz15%
Half Space Sensitivity @ 2.83V94.62 dB±1.01
Sensitivity @ 1W/1m91.9 dB±1.01
Rated Noise Power (IEC 268-5 18.1)800 W
Test Spectrum Bandwidth 40Hz ~400 Hz 12 dB/Oc
Effective Piston Area 1225.4 cm2
Moving Mass 195.8 g
Motor Force Factor 16.94 T•m
Voice Coil Inner Diameter 75.7 mm
Gap Height 10 mm
Maximum Linear Excursion 12 mm
Ferrofluid Type
Minimum Impedance 4.3 Ω±7.5%
Voice Coil Inductance 1.05 mH
Mechanical Q Factor 14.98
Electrical Q Factor 0.44
Total Q Factor 0.42
Ratio 66.19 fs/Qts
Energy Bandwidth Product ((1/Qes)•fs)
Suspension Compliance 0.2 μm/N
Effective Cone Diameter 39.5 cm
Motor Efficiency Factor 78.2 (T•m2)/Ω
Voice Coil Former Material TIL-P
Transducer Mass 12.06 Kg
Equivalent Volume 356 L

This 18 inch 4 ohm speaker features a FEA optimized ferrite magnet motor, 3inch voice coil, cloth surround, paper cone, a vented yoke for motor cooling, and a high strength stamped steel frame. Kevlar loaded non-pressed paper cone to help dampen and control cone resonance. The multi-roll surround and spider have been optimized to reduce distortion over the excursion range of this transducer.