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Depth: 4.5", 114.3mm Weight: 2lbs, 909g Replacement driver: APT:50 Throat Size 1", 25.4mm Nominal Impedance 8 ohms Power Rating 35W @ 3.5kHz Free Air Resonance 2.1kHz Usable Frequency Range 3.5Hz-20kHz Sensitivity 104.7dB (1W/1m across 3.5kHz-20kHz) Magnet Weight 7.75oz, 0.22kg Voice Coil Diameter 1" / 25.4mm THIELE and SMALL PARAMETERS DC Resistance (Re) 6.3 Coil Inductance (Le) 1.5mH MOUNTING INFO Overall Diameter 2.75", 70mm Mounting Holes Diameter ~ Mounting Holes B.C.D. ~ Mounting Thread Use Apt Horn or Adaptor Depth 2.53", 64.3mm Weight 1.65 lbs., 0.75 kg MATERIALS OF CONSTRUCTION Diaphragm Material Phenolic Magnet Composition Ferrite