Specifications:Model code: TRF SB25RNDNominal diameter: 50MMOhmic resistance: 4 ohmsPower watt MAX: 150WPower watt RMS: 75WSensitivity (1w / 1m): 108 dBFrequency range: 3.5-18KHzVoice coil diameter: Φ25 mmFs: 3.5KHzRe (D.C.): 3.6 ΩVoice coil wire: CCARVoice coil FORMER: HEXATECH ALUMINUM 1.5 ''Magnet: NEODYMIUMMagnet dimension: Net weight: 0.300 kgDimension: