Eighteen Sound 21NLW9001
4Ω
8ΩSubwoofer
21″ / 533 mm
Nominal diameter
31 Hz
Resonance
0.34
Q factor
95 dB
Sensitivity
± 14 mm
Linear excursion
3600 W
Program Power
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- Sensitivity (1W, 1m, infinite baffle)
- SPL1W
- 94.6
- dB
- Frequency response
- 25 - 1500
- Hz
- Resonance frequency (free air)
- fS
- 31.0
- Hz
- Mechanical quality factor
- QMS
- 4.54
- Electrical quality factor
- QES
- 0.37
- Total quality factor
- QTS
- 0.34
- Maximum linear excursion
- xmax
- 14.0
- mm
- Air volume displaced at xmax
- VD
- 2327
- cm³
- Power handling
- P
- 1800
- W
- Program power
- Pmax
- 3600
- W
- Nominal impedance
- Z
- 4
- Ω
- DC resistance
- RE
- 2.9
- Ω
- Inductance (1kHz)
- LE
- 2.2
- mH
- VC Diameter
- 135
- mm
- Force factor
- Bl
- 23.8
- N/A
- Motor constant
- Bl/√RE
- 14.0
- N/√W
- Material
- Neodymium
- Effective diameter
- 460
- mm
- Effective area
- SD
- 1662
- cm²
- Moving mass
- MMS
- 375
- g
- Moving mass (without air load)
- MMD
- 327.5
- g
- Material
- Weather protected
- Stiffness
- KMS
- 14.29
- N/mm
- Compliance
- CMS
- 70
- µm/N
- Equivalent volume to the compliance
- VAS
- 272
- L
- Mechanical resistance
- RMS
- 16.09
- N·s/m
- Nominal diameter
- 21
- ″
- 533
- mm
- Overall diameter
- 545
- mm
- Baffle cutout diameter
- 492
- mm
- Overall depth
- 250
- mm
- Flange thickness
- 18
- mm
- Mounting depth
- 232
- mm
- Volume occupied by the driver (estimated)
- 9.1
- L
- Net weight
- 13.4
- 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
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