Eighteen Sound 21NLW4100 8Ω
4Ω
8Ω
Subwoofer
21″ / 533 mm
Nominal diameter
36 Hz
Resonance
0.46
Q factor
94 dB
Sensitivity
± 15.2 mm
Linear excursion
3000 W
Program Power
![Eighteen Sound 21NLW4100 8Ω Subwoofer](/18Sound/21NLW4100_8Ω/18Sound_21NLW4100_8Ω_(Photo_1).png)
![Eighteen Sound 21NLW4100 8Ω Subwoofer](/18Sound/21NLW4100_8Ω/18Sound_21NLW4100_8Ω_(Photo_2).png)
- Sensitivity (1W, 1m, infinite baffle)
- SPL1W
- 94.2
- dB
- Frequency response
- 32 - 300
- Hz
- Resonance frequency (free air)
- fS
- 36.0
- Hz
- Mechanical quality factor
- QMS
- 7.80
- Electrical quality factor
- QES
- 0.49
- Total quality factor
- QTS
- 0.46
- Maximum linear excursion
- xmax
- 15.2
- mm
- Air volume displaced at xmax
- VD
- 2525
- cm³
- Power handling
- P
- 1500
- W
- Program power
- Pmax
- 3000
- W
- Nominal impedance
- Z
- 8
- Ω
- DC resistance
- RE
- 5.1
- Ω
- Inductance (1kHz)
- LE
- 2.1
- mH
- VC Diameter
- 100
- mm
- Winding height
- HVC
- 36.5
- mm
- Winding material
- Copper
- Force factor
- Bl
- 29.4
- N/A
- Motor constant
- Bl/√RE
- 13.0
- N/√W
- Air gap height
- HAG
- 12.4
- mm
- Material
- Neodymium
- Effective diameter
- 460
- mm
- Effective area
- SD
- 1661
- cm²
- Moving mass
- MMS
- 374
- g
- Moving mass (without air load)
- MMD
- 326.5
- g
- Material
- Water repellent
- Stiffness
- KMS
- 19.23
- N/mm
- Compliance
- CMS
- 52
- µm/N
- Equivalent volume to the compliance
- VAS
- 210
- L
- Mechanical resistance
- RMS
- 10.85
- N·s/m
- Nominal diameter
- 21
- ″
- 533
- mm
- Overall diameter
- 545
- mm
- Baffle cutout diameter
- 492
- mm
- Overall depth
- 247
- mm
- Flange thickness
- 7
- mm
- Mounting depth
- 240
- mm
- Volume occupied by the driver (estimated)
- 7.7
- L
- Net weight
- 10.5
- kg
Thiele & Small parameters
Large signal parameters
Voice Coil
Magnet
Diaphragm
Suspensions
Dimensions
![Eighteen Sound 21NLW4100 8Ω Impedance](/18Sound/21NLW4100_8Ω/18Sound_21NLW4100_8Ω_(Impedance).gif)
![Eighteen Sound 21NLW4100 8Ω SPL](/18Sound/21NLW4100_8Ω/18Sound_21NLW4100_8Ω_(Frequency_response).gif)
![Eighteen Sound 21NLW4100 8Ω Dimensions](/18Sound/21NLW4100_8Ω/18Sound_21NLW4100_8Ω_(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)