Eighteen Sound 21NLW4000 8Ω
4Ω
8Ω
Subwoofer
21″ / 533 mm
Nominal diameter
29 Hz
Resonance
0.37
Q factor
94 dB
Sensitivity
± 15 mm
Linear excursion
3200 W
Program Power
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- Sensitivity (1W, 1m, infinite baffle)
- SPL1W
- 94.4
- dB
- Frequency response
- 30 - 1800
- Hz
- Resonance frequency (free air)
- fS
- 29.0
- Hz
- Mechanical quality factor
- QMS
- 22.00
- Electrical quality factor
- QES
- 0.38
- Total quality factor
- QTS
- 0.37
- Maximum linear excursion
- xmax
- 15.0
- mm
- Air volume displaced at xmax
- VD
- 2490
- cm³
- Power handling
- P
- 1600
- W
- Program power
- Pmax
- 3200
- W
- Nominal impedance
- Z
- 8
- Ω
- DC resistance
- RE
- 4.9
- Ω
- Inductance (1kHz)
- LE
- 2.8
- mH
- VC Diameter
- 100
- mm
- Winding material
- Copper
- Force factor
- Bl
- 30.0
- N/A
- Motor constant
- Bl/√RE
- 13.6
- N/√W
- Material
- Neodymium
- Effective diameter
- 460
- mm
- Effective area
- SD
- 1660
- cm²
- Moving mass
- MMS
- 380
- g
- Moving mass (without air load)
- MMD
- 332.5
- g
- Material
- Water,UV repellent
- Stiffness
- KMS
- 12.66
- N/mm
- Compliance
- CMS
- 79
- µm/N
- Equivalent volume to the compliance
- VAS
- 305
- L
- Mechanical resistance
- RMS
- 3.15
- N·s/m
- Nominal diameter
- 21
- ″
- 533
- mm
- Overall diameter
- 545
- mm
- Baffle cutout diameter
- 492
- mm
- Overall depth
- 245
- mm
- Flange thickness
- 18
- mm
- Mounting depth
- 227
- mm
- Volume occupied by the driver (estimated)
- 8.2
- L
- Net weight
- 11.6
- kg
Thiele & Small parameters
Large signal parameters
Voice Coil
Magnet
Diaphragm
Suspensions
Dimensions
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Export this driver to a simulation software:
WinISD
Basta!
Hornresp
QSpeakers
SpeakerSim
MfbLabs
Speakerbench.jpg.webp)
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