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.
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