SB Acoustics SB12PFCR25-8 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 8 ?
• DC resistance, Re 6.4 ?
• Voice coil inductance, Le 0.36 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 64 Hz
• Sensitivity (2.83 V / 1 m) 84.5 dB
• Mechanical Q-factor, Qms 4.10
• Electrical Q-factor, Qes 0.65
• Total Q-factor, Qts 0.56
• Moving mass incl. air, Mms 5.1 g
• Force factor, Bl 4.5 Tm
• Equivalent volume, VAS 4.3 liters
• Compliance, Cms 1.21 mm/N
• Mechanical loss, Rms 0.5 kg/s
• Rated power handling* 30 W

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