SB Acoustics SB20PFC30-4

SB Acoustics SB20PFCR30-4 8" Woofer

• Proprietary cone material with natural fibers made in-house
• Light weight foam surround
• Optimized whizzer cone for smooth high frequency extension
• Phase plug for controlled radiation
• Large spider for improved linearity
• Optimized motor system
• Vented reinforced plastic chassis
• Non-conductive coil former
• Long life lead wires
• Extended copper sleeve on pole piece

Specifications

• power handling (continuous/programme) = 50 W
• frequency range = 30-5000 Hz
• resonance frequency fs = 33,7 Hz
• impedance R = 4 Ohm
• sound pressure level SPL = 92.5 dB (2,83V; 1m)
• DC resistance Re = 3,4 Ohm
• force factor BL = 6,6 N/A
• voice coil inductance L = 0.71 mH
• effective piston radiating area Sd = 216 cm²
• effective mechanical mass incl. air load mms = 22,4 g
• equivalent volume of compliance Vas = 66,2 l
• total Q factor Qts = 0.33 (Qms=2.78, Qes=0.37)
• voice coil diameter = 30 mm
• mounting diameter d = 187 mm
• overall diameter d = 233mm
• mounting depth (not countersunk) t = 82,4 mm