Product typeLoudspeaker ChassisTypePANominal Diameter18 ", 457 mmVoice Coil4 ", 102 mmOverall diameter460 mmPitch Circle Diameter439.9 mmCut- out Measurement421.6 mmDiameter of fixing holes7.1 mmDepth226.1 mmNominal Impedance8 Ohm(s)Nominal Load Capacity1600 Wmaximum rated load3200 WSensitivity (1 W / 1 m)96.6 dBFrequency response27 - 1300 HzVoice Coil MaterialcopperMagnetNeodymiumThiele & Small ParameterFs (Resonance Frequency)36 HzRe (DC resistance)5.86 Ohm(s)Qms (mechanical quality)8.46Le (inductance of the voice coil)1.54 mHQes (electrical quality)0.39Qts (overall quality)0.38Vas (equivalent volume)164.49Mms (moving mass)237 gBL (power factor)28.24 T/mXmax (maximum displacement)15.21 mmCms (elasticity of the suspension)0.08 mm/NSd (membrane area)1217 cm2Weight9,48 kg