Product typeLoudspeaker ChassisNominal Diameter18 ", 457.2 mmVoice Coil4 ", 101.6 mmOverall diameter458 mmPitch Circle Diameter440 mmCut- out Measurement414 mmMounting holes8Diameter of fixing holes8.5 mmDepth237 mmNominal Impedance4 Ohm(s)Nominal Load Capacity1200 Wmaximum rated load2400 WSensitivity (1 W / 1 m)95 dBFrequency response20 - 200 HzVoice Coil MaterialcopperMagnetNeodymiumDepth of the magnetic gap12 mmThiele & Small ParameterFs (Resonance Frequency)29.8 HzRe (DC resistance)5 Ohm(s)Weight9,8 kg