General Specifications Nominal diameter:127mm/5in Power rating1: 30Wrms Nominal impedance: 8ohm Sensitivity2: 91dB Frequency range: 130-8000Hz Voice coil diameter: 25mm/1in Chassis type: Pressed steel Magnet type: Ferrite Magnet weight: 0.37kg/13oz Coil material: Round copper Former material: Polyimide Cone material: Kevlar loaded paper Surround material: Cloth-sealed Suspension: Single Xmax3:1.1mm/0.04in Gap depth: 5mm/0.20in Voice coil winding width: 7.3mm/0.29in Small Signal Parameters D: 0.10m/3.94in Fs: 106Hz Mms: 5.7g/0.201oz Mmd: 5.3g/0.187oz Qms: 2.40 Qes: 0.58 Qts: 0.46 Re: 6.43ohm Vas: 4.2lt/0.15ft3 Bl: 6.5Tm Cms: 0.40mm Rms: 1.60kg/s Le (at 1kHz): 0.38mH Mounting Information Overall diameter: 136 x 151mm/5.35 x 5.94in Overall depth: 68mm/2.68in Cut-out diameter: 117mm/4.61in Mounting slot dimensions: diam 4.5mm/0.18in Number of mounting slots: 4 Mounting PCD range: 140mm/5.51in Unit weight: 1.0kg/2.2lb Packed Dimensions & Weight Single pack size W x D x H: 170mm x 180mm x 70mm/6.7in x 7.1in x 2.8in Single pack weight: 1.5kg/3.3lb Multi pack (12) size W x D x H: 320mm x 550mm x 190mm /12.6in x 21.7in x 7.5in Multi pack (12) weight: 13kg/29lb