SICA 21 S 4 PL
Subwoofer
21″ / 545 mm
Nominal diameter
35 Hz
Resonance
0.3
Q factor
97 dB
Sensitivity
± 5.2 mm
Linear excursion
2400 W
Program Power
![SICA 21 S 4 PL Subwoofer](/SICA/21S4PL/SICA_21S4PL_(Photo_1).jpg)
![SICA 21 S 4 PL Subwoofer](/SICA/21S4PL/SICA_21S4PL_(Photo_2).jpg)
![SICA 21 S 4 PL Subwoofer](/SICA/21S4PL/SICA_21S4PL_(Photo_3).jpg)
- Sensitivity (1W, 1m, infinite baffle)
- SPL1W
- 96.6
- dB
- Frequency response
- 35 - 500
- Hz
- Resonance frequency (free air)
- fS
- 34.6
- Hz
- Mechanical quality factor
- QMS
- 9.95
- Electrical quality factor
- QES
- 0.31
- Total quality factor
- QTS
- 0.30
- Maximum linear excursion
- xmax
- 5.2
- mm
- Air volume displaced at xmax
- VD
- 864
- cm³
- Power handling
- P
- 1200
- W
- Program power
- Pmax
- 2400
- W
- Nominal impedance
- Z
- 8
- Ω
- DC resistance
- RE
- 5.7
- Ω
- Inductance (1kHz)
- LE
- 1.6
- mH
- VC Diameter
- 100
- mm
- Winding height
- HVC
- 17
- mm
- Winding material
- Copper
- Former material
- Glass Fiber
- Flux density
- B
- 0.89
- T
- Force factor
- Bl
- 36.1
- N/A
- Motor constant
- Bl/√RE
- 15.1
- N/√W
- Weight
- 0.536
- kg
- Material
- Neodymium
- Effective diameter
- 460
- mm
- Effective area
- SD
- 1662
- cm²
- Moving mass
- MMS
- 325
- g
- Moving mass (without air load)
- MMD
- 277.5
- g
- Material
- Paper
- Stiffness
- KMS
- 15.39
- N/mm
- Compliance
- CMS
- 65
- µm/N
- Equivalent volume to the compliance
- VAS
- 255
- L
- Mechanical resistance
- RMS
- 7.1
- N·s/m
- Surround material
- Treated Cloth
- Nominal diameter
- 21
- ″
- 545
- mm
- Overall diameter
- 545
- mm
- Baffle cutout diameter
- 497
- mm
- Overall depth
- 249
- mm
- Volume occupied by the driver (estimated)
- 7.8
- L
- Net weight
- 10.5
- kg
- Frame material
- Aluminium Die-Cast
Thiele & Small parameters
Large signal parameters
Voice Coil
Magnet
Diaphragm
Suspensions
Dimensions
![SICA 21 S 4 PL SPL & Impedance](/SICA/21S4PL/SICA_21S4PL_(Frequency_response_+_Impedance).png)
![SICA 21 S 4 PL Dimensions](/SICA/21S4PL/SICA_21S4PL_(Dimensions).png)
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)