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 Resistance 7.36 Ω±5.0%
Resonant Frequency 31.72 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 Bandwidth Fo~400 Hz 12 dB/Oc
Effective Piston Area 1225.4 cm2
Moving Mass 190.5 g
Motor Force Factor 21.57 T•m
Voice Coil Inner Diameter 75.7 mm
Gap Height 10 mm
Maximum Linear Excursion 12.6 mm
Ferrofluid Type
Minimum Impedance 8.8 Ω±7.5%
Voice Coil Inductance 1.55 mH
Mechanical Q Factor 13.4
Electrical Q Factor 0.6
Total Q Factor 0.58
Ratio 54.41 fs/Qts
Energy Bandwidth Product ((1/Qes)•fs)
Suspension Compliance 132 μm/N
Effective Cone Diameter 39.5 cm
Motor Efficiency Factor 63.2 (T•m2)/Ω
Voice Coil Former Material TIL-P
Transducer Mass 12.02 Kg
Equivalent Volume 280.83 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.