Eighteen Sound 21NLW4000 8Ω
4Ω
8Ω
Subwoofer
| Nominal diameter | 21″ / 533 mm |
| Resonance | 29 Hz |
| Q factor | 0.37 |
| Sensitivity | 94.4 dB |
| Linear excursion | ± 15 mm |
| Program power | 3200 W |
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Specifications
- Sensitivity (1W, 1m, infinite baffle) SPL1W 94.4dB
- Frequency response 30 - 1800Hz
Thiele & Small parameters
- Resonance frequency (free air) fS 29Hz
- Mechanical quality factor QMS 22.00
- Electrical quality factor QES 0.38
- Total quality factor QTS 0.37
Large signal parameters
- Maximum linear excursion (one way) xmax 15mm
- Air volume displaced at xmax VD 2490cm³
- Power handling P 1600W
- Program power Pmax 3200W
Voice Coil
- Nominal impedance Z 8Ω
- DC resistance RE 4.9Ω
- Inductance (1kHz) LE 2.8mH
- VC Diameter 100mm
- Winding material Copper
Magnet
- Force factor Bl 30N/A
- Motor constant Bl/√RE 13.6N/√W
- Material Neodymium
Diaphragm
- Effective diameter 460mm
- Effective area SD 1660cm²
- Moving mass (including air load) MMS 380g
- Moving mass MMD 333g
- Material Water,UV repellent
Suspensions
- Stiffness KMS 12.7N/mm
- Compliance CMS 79µm/N
- Equivalent volume to the compliance VAS 305L
- Mechanical resistance RMS 3.15N·s/m
Dimensions
- Nominal diameter 21″
- 533mm
- Overall diameter 545mm
- Baffle cutout diameter 492mm
- Overall depth 245mm
- Flange thickness 18mm
- Mounting depth 227mm
- Volume occupied by the driver (estimated) 8.2L
- Net weight 11.6kg
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Export this driver to a box design software:
Closed Box Simulator·
Speakerbench
WinISD
Basta!
Hornresp
QSpeakers
SpeakerSim
MfbLabs
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