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 Resistance6.18 Ω±5.0%
Resonant Frequency30.6 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 Bandwidth40Hz -400Hz 12 dB/Oc
Effective Piston Area1225.4 cm2
Moving Mass206.2 g
Motor Force Factor20.41 T•m
Voice Coil Inner Diameter75.7 mm
Gap Height10 mm
Maximum Linear Excursion9.4 mm
Ferrofluid Type
Minimum Impedance7.86 Ω±7.5%
Voice Coil Inductance4.31 mH
Mechanical Q Factor12.86
Electrical Q Factor0.59
Total Q Factor0.56
Ratio54.35 fs/Qts
Energy Bandwidth Product ((1/Qes)•fs)
Suspension Compliance131 μm/N
Effective Cone Diameter39.5 cm
Motor Efficiency Factor67.4 (T•m2)/Ω
Voice Coil Former MaterialTIL
Transducer Mass7.5 Kg
Equivalent Volume278.5 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.