Transducer Size (Millimeters)457.2
DC Resistance6.18
Resonant Frequency30.6
Half Space Sensitivity91.83
Rated Noise Power700
Test Spectrum Bandwidth40Hz -400Hz

Transducer Size (Millimeters) 457.2
DC Resistance 6.18 Ω±5.0%
Resonant Frequency 30.6 Hz15%
Half Space Sensitivity @ 2.83V91.83 dB±1.01
Sensitivity @ 1W/1m91.7 dB±1.01
Rated Noise Power (IEC 268-5 18.1)700 W
Test Spectrum Bandwidth 40Hz -400Hz 12 dB/Oc
Effective Piston Area 1225.4 cm2
Moving Mass 206.2 g
Motor Force Factor 20.41 T•m
Voice Coil Inner Diameter 75.7 mm
Gap Height 10 mm
Maximum Linear Excursion 9.4 mm
Ferrofluid Type
Minimum Impedance 7.86 Ω±7.5%
Voice Coil Inductance 4.31 mH
Mechanical Q Factor 12.86
Electrical Q Factor 0.59
Total Q Factor 0.56
Ratio 54.35 fs/Qts
Energy Bandwidth Product ((1/Qes)•fs)
Suspension Compliance 131 μm/N
Effective Cone Diameter 39.5 cm
Motor Efficiency Factor 67.4 (T•m2)/Ω
Voice Coil Former Material TIL
Transducer Mass 7.5 Kg
Equivalent Volume 278.5 L

This 18 inch 8 ohm speaker features a FEA optimized ferrite magnet motor, a 3 inch high-temperature voice coil, and a high strength stamped steel frame. The multi-roll surround and spider have been optimized to reduce distortion over the excursion range of this transducer.