SB Acoustics SB12PFCR25-4 4'' Paper Cone Woofer

Features:

• Vented reinforced plastic chassis
• Proprietary cone material with natural fibers made in-house
• Butyl rubber surround for smooth frequency response
• Vented motor system for low compression
• Long stroke linear suspension for improved dynamics
• Non-resonant long life lead wires

Specifications:

• Nominal Impedance 4 ?
• DC resistance, Re 3.1 ?
• Voice coil inductance, Le 0.26 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 0.84 T
• Magnet weight 0.32 kg
• Net weight 0.7 kg
• Free air resonance, Fs 58 Hz
• Sensitivity (2.83 V / 1 m) 87.5 dB
• Mechanical Q-factor, Qms 3.4
• Electrical Q-factor, Qes 0.49
• Total Q-factor, Qts 0.43
• Moving mass incl. air, Mms 5.3 g
• Force factor, Bl 3.5 Tm
• Equivalent volume, VAS 5.2 liters
• Compliance, Cms 1.42 mm/N
• Mechanical loss, Rms 0.6 kg/s
• Rated power handling* 30 W

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