SB Acoustics PFC SB20PFCR30-4 8" Woofer
Speaker Drivers · SKU: SB20PFCR30-4 · Brand SB Acoustics
฿2,400 (incl. VAT) · In stock
SB Acoustics PFC SB20PFCR30-4 8" Woofer specifications
| Diameter Cone diameter — larger cones move more air and reach deeper bass | 8" |
|---|---|
| Impedance Voice-coil electrical resistance — must match your amplifier (e.g. 4Ω/8Ω) | 4 Ω |
| Power (RMS) Continuous power the driver handles safely (RMS) — not peak power | 50 W |
| Sensitivity (SPL) Sensitivity — loudness at 1W/1m; higher means louder with less amplifier power | 92.5 dB |
| Fs Free-air resonance frequency — lower generally means deeper bass extension | 34 Hz |
| Qts Total Q at resonance (electrical + mechanical) — guides the sealed vs ported choice | 0.33 |
| Qes Electrical Q at resonance — comes from the magnet motor strength | 0.37 |
| Qms Mechanical Q at resonance — from damping of the surround and spider | 2.78 |
| Vas Equivalent air volume of the suspension compliance — used to size the enclosure | 66.2 L |
| Sd Effective cone area that actually moves air | 216 cm² |
| Xmax Maximum linear excursion — more travel means louder bass without distortion | 5.75 mm |
| Re DC resistance of the voice coil | 3.4 Ω |
| Le Voice-coil inductance — affects high-frequency response | 0.71 mH |
| Mms Total moving mass, including the air load | 22.4 g |
| BL Motor force factor (magnetic flux × coil length) — higher means tighter cone control | 6.6 T·m |
| Weight Driver weight | 1420 g |