SB Acoustics SB12NRX25-8 4" Norex Cone Woofer

Features:

• Proprietary cone material with natural fibres made in-house
• High damping Butyl rubber surround for non-resonant sound character
• Vented pole piece for reduced compression
• Vented cast aluminium chassis for optimum strength and low compression
• CCAW voice coil for reduced moving mass
• Long life silver lead wires
• Non-conducting fibre glass coil former for minimum damping
• Shorting ring in motor system for reduced distortion

Specifications:

• Nominal Impedance 8 ?
• DC resistance, Re 6.4 ?
• Voice coil inductance, Le 0.34 mH
• Effective piston area, Sd 50 cm2
• Voice coil diameter 25.4 mm
• Voice coil height 15 mm
• Air gap height 5 mm
• Linear coil travel (p-p) 10 mm
• Magnetic flux density 1.07 T
• Magnet weight 0.40 kg
• Net weight 0.92 kg
• Free air resonance, Fs 57 Hz
• Sensitivity (2.83 V / 1 m) 85.5 dB
• Mechanical Q-factor, Qms 4.1
• Electrical Q-factor, Qes 0.41
• Total Q-factor, Qts 0.37
• Moving mass incl. air, Mms 5.2 g
• Force factor, Bl 5.4 Tm
• Equivalent volume, VAS 5.3 liters
• Compliance, Cms 1.49 mm/N
• Mechanical loss, Rms 0.45 kg/s
• Rated power handling* 30 W

* IEC 268-5, T/S parameters measured on drive units that are broken in.