SB Acoustics SB20PFCR30-4 8'' Paper Cone Woofer

Features

• Vented reinforced plastic chassis
• Proprietary cone material with natural fibers made in-house
• Soft low damping rubber surround for improved transient response
• Large spider for improved linearity
• Optimized motor system
• Vented coil former for low compression
• Non-resonant long life lead wires

Specifications

• Nominal Impedance 4 ?
• DC resistance, Re 3.4 ?
• Voice coil inductance, Le 0.71 mH
• Effective piston area, Sd 216 cm²
• Voice coil diameter 30.5 mm
• Voice coil height 16.5 mm
• Air gap height 5 mm
• Linear coil travel (p-p) 11.5 mm
• Magnetic flux density 1.2 T
• Magnet weight 0.54 kg
• Net weight 1.42 kg
• Free air resonance, Fs 34 Hz
• Sensitivity (2.83V/1m) 92.5 dB
• Mechanical Q-factor, Qms 2.78
• Electrical Q-factor, Qes 0.37
• Total Q-factor, Qts 0.33
• Moving mass incl. air,Mms 22.4 g
• Force factor, Bl 6.6 Tm
• Equivalent volume, Vas 66.2 liters
• Compliance, Cms 1.0 mm/N
• Mechanical loss, Rms 1.7 kg/s
• Rated power handling* 50 W

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