Speaker type: 165 mm / 6.5” SQ midwoofer Impedance (nominal): 4 ohms Frequency response: 40 Hz – 5 kHz Basket: Aluminum cast Cone: Kevlar Motor: Neodymium-ferrite hybrid system Voice coil: 38 mm / 1.5“ CCA Power handling: (RMS) 130 Watts (12dB/oct HPF@ 60 Hz) Power handling: (max.) 190 Watts (12dB/oct HPF@ 60 Hz) Technical Parameters (TSP) Resonance frequency: 43 Hz Efficiency: (SPL) 88 dB Re: 3.3 ohms Qms: 4.57 Qes: 0.53 Qts: 0.48 Vas: 24.13 L / 0.82 cu.ft. Mms: 14.3 g BL: 4.85 N/A Rms: 0.84 kg/s Cms: 0.98 mm/N LE: 0.18 mH Xmax: (excursion) 12 mm / 0.47“ (peak-peak)