Fi Car Audio SP4 18v2+ D2
2x1Ω
2x2Ω
Subwoofer
Nominal diameter | 18″ / 470 mm |
Resonance | 24.9 Hz |
Q factor | 0.37 |
Sensitivity | 89.8 dB |
Linear excursion | ± 33 mm |
Program Power | 7000 W |
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- Sensitivity (1W, 1m, infinite baffle) SPL1W 89.8dB
Thiele & Small parameters
- Resonance frequency (free air) fS 24.9Hz
- Mechanical quality factor QMS 9.44
- Electrical quality factor QES 0.39
- Total quality factor QTS 0.37
Large signal parameters
- Maximum linear excursion xmax 33mm
- Air volume displaced at xmax VD 3993cm³
- Power handling P 3500W
- Program power Pmax 7000W
Voice Coil
- Nominal impedance Z 2 x 2Ω
- DC resistance (in series) RE 2.5Ω
- Inductance (1kHz, in series, estimated) LE 3.78mH
Magnet
- Force factor (in series) Bl 24N/A
- Motor constant Bl/√RE 15.1N/√W
Diaphragm
- Effective diameter 393mm
- Effective area SD 1210cm²
- Moving mass MMS 555g
- Moving mass (without air load) MMD 525g
Suspensions
- Stiffness KMS 13.7N/mm
- Compliance CMS 73.1µm/N
- Equivalent volume to the compliance VAS 150L
- Mechanical resistance RMS 9.2N·s/m
Dimensions
- Nominal diameter 18″
- 470mm
- Overall diameter 470mm
- Baffle cutout diameter 425mm
- Mounting depth 311mm
- Volume occupied by the driver 7.36L
Export this driver to a simulation software:
Closed Box Simulator·





