SB ACOUSTICS SB29NRX75-6, 29cm NOREX PAPER CONE WOOFER 6OHMFeatures Hard paper cone for improved piston operation (made in-house) Vented pole piece for minimum compression Vented cast aluminum chassis for optimum strength and low compression 3″ copper voice coil for improved power handling Long life silver lead wires Low damping rubber surround for improved dynamic linearity Non-conducting fiber glass voice coil former for minimum damping Specs Nominal Impedance 6 Ω DC resistance, Re 4.2 Ω Voice coil inductance, Le 1.8 mH Effective piston area, Sd 312 cm2 Voice coil diameter 75.6 mm Voice coil height 28 mm Air gap height 6 mm Linear coil travel (p-p) 22 mm Magnetic flux density 0.9 T Magnet weight 2.1 kg Net weight 5.30 kg Free air resonance, Fs 21 Hz Sensitivity (2.83V/1m) 88 dB Mechanical Q-factor, Qms 5.7 Electrical Q-factor, Qes 0.38 Total Q-factor, Qts 0.35 Moving mass incl. air,Mms 78 g Force factor, Bl 10.7 Tm Equivalent volume, Vas 102 liters Compliance, Cms 0.74 mm/N Mechanical loss, Rms 1.8 kg/s Rated power handling* 200 W * IEC 268-5, T/S parameters measured on drive units that are broken in.
