Eighteen Sound |
21NLW4000 |
21NLW4000-8 |
ALT214000WF08NA - 022218N400 |
Cone driver |
Sold by piece |
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Brand Eighteen Sound |
Model 21NLW4000 |
TLHP code 21NLW4000-8 |
Manufacturer code ALT214000WF08NA - 022218N400 |
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Product type Cone driver |
Sales packaging Sold by Piece |
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If you want to purchase more than the quantity in stock, have a look at the supply time below :
Indicative average supply lead time: 11 weeks
94 dB SPL 1W / 1m average sensitivity
100 mm (4") Interleaved Sandwich Voice coil (ISV)
3200 Watt program power handling
Composite reinforced straight ribbed cone
Optimized high grade neodymium magnet assembly
Recommended for subwoofer usage in compact vented or bandpass enclosures
The 21NLW4000 is a 21" (533 mm) extended low frequency loudspeaker, designed for use in vented or bandpass enclosure. The loudspeaker is designed to withstand high power levels without damage while providing clean and undistorted LF reproduction at a very high SPL. For optimum results we recommend amplifiers able to deliver 3200 Watt program power. The 21NLW4000 features a unique motor featuring a high grade neodymium magnet assembly in a structure optimized for thermal and magnetic efficiency. 21NLW4000 features include a large displacement suspension system which, in conjunction with a composite reinforced, straight ribbed cone, allows an ultra-linear piston action and provides full mechanical control across the entire working range. The 100mm (4 in) state-of-the-art voice-coil utilizing Interleaved Sandwich Voice coil (ISV) technology, provides high levels of thermal stability and durability. The ISV technology achieves a balanced linear motor unit exerting an exceptionally high force factor.
General Specifications
Nominal Diameter 533mm (21 in)
Rated Impedance 8 Ohm
AES Power 1500W
Program Power 3200 W
Sensitivity 94 dB
Frequency Range 30-1800Hz
Power Compression @-10dB 0,62 dB
Power Compression @-3dB 2,18 dB
Power Compression @Full Power 3,57 dB
Max Recomm. Frequency 150Hz
Recomm. Enclosure Volume 120-300 lt (4.24 - 10.60 cuft)
Minimum Impedance 6 Ohm at 25°C
Max Peak To Peak Excursion 70 mm (2.76 in)
Voice Coil Diameter 100 mm (4 in)
Voice Coil Winding Material Copper wire
Suspension Triple-roll, Polycotton
Cone Complex Composite
Thiele Small Parameters
Fs 29 Hz
Re 4,9 Ohm
Sd 0,166 sq. mt. (257,30 sq. in.)
Qms 22.0
Qes 0,38
Qts 0,37
Vas 315 lt. (11,13 cuft)
Mms 376 gr. (0,83 lb)
BL 30,0 Tm
Linear Mathematical Xmax ± 15 mm (± 0,59 in)
Le (1kHz) 2,80 mH
Ref. Efficiency 1W@1m (half space) 2%
Mounting information
Overall diameter 545 mm (21.46 in)
N. of mounting holes and bolt 8
Mounting holes diameter 8,5 mm (0,33 in)
Bolt circle diameter 520 mm (20.47 in)
Front mount baffle cutout ø 492 mm (19,37 in)
Rear mount baffle cutout ø 490 mm (19,29 in)
Total depth 245 mm (9,64 in)
Flange and gasket thickness 18 mm (0,7 in)
Net weight 11,6 kg (25.5 lb)
Shipping weight 13,1 Kg (28,8 lb)
General |
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Product type | Cone driver |
Brand | Eighteen Sound |
Reference | 21NLW4000 |
Product code | ALT214000WF08NA - 022218N400 |
Informations |
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Nominal impedance | 8 ohm |
Dimensional category | 21 inch |
Frequency coverage type | Sub, Low |
Manufacturer sensitivity | 97 dB |
Calculated sensitivity | 94.76 dB |
Nominal power handling | 1600 W |
Max power handling | 3200 W |
Bandwidth | 30÷1800 Hz |
Fundamental parameters |
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Sd | 1660 cm² |
Mms | 380 gr |
Cms | 80 µm/N |
Le | 2.8 mH |
Re | 4.9 ohm |
BL | 30 T.m |
Small signal parameters |
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Fs | 29 Hz |
Qes | 0.38 |
Qms | 22 |
Qts | 0.37 |
Vas | 305 L |
Datas |
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Xmax | ±15 mm |
EBP | 76 Hz |
Zmin | 6 ohm |
Fs / Qts | 78 Hz |
Vas * Qts² | 41.76 L |
Calculated efficiency | 1.88 % |
Weight | ~11.6 kg |
Dimensions |
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Voice coil diameter | 4 inch |
Outside diameter | 545 mm |
Baffle cutout diameter | 492 mm |
Depth | 245 mm |
Front thickness | 18 mm |
Depth after front | 227 mm |
Shape & Materials |
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Front chape | Cylindrical |
Magnet type | Neodymium |
This system is only available for technical questions. For questions of prices, availability of products and deadline thank you to send your request by the contact page.
This product is under manufacturer's warranty. This warranty protect you for the manufacturing defaults. The warranty does not protect for abnormal use of the product.