Fi Car Audio Alpha v2.1 12 S4
2Ω
4Ω
Subwoofer
12″ / 318 mm
Nominal diameter
38 Hz
Resonance
0.53
Q factor
87 dB
Sensitivity
± 17 mm
Linear excursion
1500 W
Program Power
![Fi Car Audio Alpha v2.1 12 S4 Subwoofer](/Fi/Alpha_v2.1_12_S4/Fi_Alpha_v2.1_12_S4_(Photo_1).jpg)
![Fi Car Audio Alpha v2.1 12 S4 Subwoofer](/Fi/Alpha_v2.1_12_S4/Fi_Alpha_v2.1_12_S4_(Photo_2).jpg)
![Fi Car Audio Alpha v2.1 12 S4 Subwoofer](/Fi/Alpha_v2.1_12_S4/Fi_Alpha_v2.1_12_S4_(Photo_3).jpg)
- Sensitivity (1W, 1m, infinite baffle)
- SPL1W
- 86.5
- dB
- Resonance frequency (free air)
- fS
- 38.0
- Hz
- Mechanical quality factor
- QMS
- 7.40
- Electrical quality factor
- QES
- 0.57
- Total quality factor
- QTS
- 0.53
- Maximum linear excursion
- xmax
- 17.0
- mm
- Air volume displaced at xmax
- VD
- 816
- cm³
- Power handling
- P
- 750
- W
- Program power
- Pmax
- 1500
- W
- Nominal impedance
- Z
- 4
- Ω
- DC resistance
- RE
- 3.2
- Ω
- Inductance (1kHz, estimated)
- LE
- 1.11
- mH
- Force factor
- Bl
- 15.9
- N/A
- Motor constant
- Bl/√RE
- 8.89
- N/√W
- Effective diameter
- 247
- mm
- Effective area
- SD
- 480
- cm²
- Moving mass
- MMS
- 194
- g
- Moving mass (without air load)
- MMD
- 186.1
- g
- Stiffness
- KMS
- 11.11
- N/mm
- Compliance
- CMS
- 90
- µm/N
- Equivalent volume to the compliance
- VAS
- 29.2
- L
- Mechanical resistance
- RMS
- 6.26
- N·s/m
- Nominal diameter
- 12
- ″
- 318
- mm
- Overall diameter
- 318
- mm
- Baffle cutout diameter
- 283
- mm
- Mounting depth
- 165
- mm
- Volume occupied by the driver
- 4.81
- L
Thiele & Small parameters
Large signal parameters
Voice Coil
Magnet
Diaphragm
Suspensions
Dimensions
Export this driver to a simulation software:
![WinISD](/images/export/WinISD.png)
![Basta!](/images/export/Basta.png)
![Hornresp](/images/export/Hornresp.png)
![QSpeakers](/images/export/QSpeakers.png)
![SpeakerSim](/images/export/SpeakerSim.png)
![MfbLabs](/images/export/MfbLabs.png)
![Speakerbench](/images/export/Speakerbench.png)