Transducer Size (Millimeters)457.2
DC Resistance7.36
Resonant Frequency31.72
Half Space Sensitivity91.56
Rated Noise Power600
Test Spectrum BandwidthFo~400 Hz

Transducer Size (Millimeters)457.2
DC Resistance7.36 Ω±5.0%
Resonant Frequency31.72 Hz15%
Half Space Sensitivity @ 2.83V91.56 dB±1.01
Sensitivity @ 1W/1m92 dB±1.01
Rated Noise Power (IEC 268-5 18.1)600 W
Test Spectrum BandwidthFo~400 Hz 12 dB/Oc
Effective Piston Area1225.4 cm2
Moving Mass190.5 g
Motor Force Factor21.57 T•m
Voice Coil Inner Diameter75.7 mm
Gap Height10 mm
Maximum Linear Excursion12.6 mm
Ferrofluid Type
Minimum Impedance8.8 Ω±7.5%
Voice Coil Inductance1.55 mH
Mechanical Q Factor13.4
Electrical Q Factor0.6
Total Q Factor0.58
Ratio54.41 fs/Qts
Energy Bandwidth Product ((1/Qes)•fs)
Suspension Compliance132 μm/N
Effective Cone Diameter39.5 cm
Motor Efficiency Factor63.2 (T•m2)/Ω
Voice Coil Former MaterialTIL-P
Transducer Mass12.02 Kg
Equivalent Volume280.83 L

This 18 inch 8 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.