Specifications:Model code: TRF SB32NDNominal diameter: 99.8MMOhmic resistance: 4 ohmsPower watt MAX: 300WPower watt RMS: 150WSensitivity (1w / 1m): 108 dBFrequency range: 3.5-25KHzVoice coil diameter: Φ32mmFs: 3.5KHzRe (D.C.): 3.6 ΩVoice coil wire: CCAWVoice coil FORMER: HEXATECH ALUMINUM Magnet: NEODYMIUMMagnet dimension: 67Net weight: 0.545 kgDimension: 99.8*43.5mm