Eighteen Sound |
8NMB420 |
8NMB420-8 |
ALT080420WF08NA - 022088N400 |
Cone driver |
Sold by piece |
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Brand Eighteen Sound |
Model 8NMB420 |
TLHP code 8NMB420-8 |
Manufacturer code ALT080420WF08NA - 022088N400 |
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Product type Cone driver |
Sales packaging Sold by Piece |
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This product is in the process of supply to be in stock.
Reserved on order
Next TLHP reception estimated between Jul 15, 2024 and Jul 22, 2024
The 8NMB420 neodymium transducer has been developed in response to a specific market requirement for a 8" midbass driver that combines excellent linearity with good efficiency and high power handling capabilities.
8NMB420 is primarily intended for use as a midbass driver in compact 2-way or multiway reflex enclosures comprising line arrays. The parameters had been chosen to offer significant low frequency output in vented enclosure with size starting from 20 lit. with a tuning frequency around 60Hz. The low pass filter might be positioned as high as 2000-2500Hz. Multiple 8NMB420 units might be used: the compact size reflects in the capability to have precise attack time. This characteristic makes it the ideal choice for stage monitoring and bass guitar amplification. The extremely powerful external neodymium magnet assembly assures high flux concentration, low power compression and excellent heat exchange. The levels of force factor and power handling are, as a consequence, at the upper professional level with best power to weight ratio.
The exclusive dedicated double roll surround design offers enhanced linear travel and control, in order to reproduce precisely low frequency. The curvilinear paper cone is formed using a unique wood pulp composition designed to achieve the best possible rigidity and stiffness.
The 50mm inside outside aluminum voice coil employs Interleaved Sandwich Voice coil (ISV) technology. It is composed by a high strength fiberglass former used to carry windings on both the outer and inner surfaces to achieve a mass balanced coil. This results in an extremely linear motor assembly which, in conjunction with the highly advanced design of the magnetic structure, provides a high force factor or BL. The voice coil is cooled incorporating airways between the chassis back plate and the magnet faceplate so that heated air is channeled away from the voice coil and gap and dissipated by the chassis basket. Thanks to the increasing use during outdoor audio events, the ability to perform in humid environments is a key feature of the 8NMB420. This is achieved trough a proprietary humidity repellent cone treatment without a moving speaker mass increase.
95 dB SPL 1W / 1m average sensitivity
51mm (2 in) Interleaved Sandwich Voice coil (ISV)
280 W AES power handling
External neodymium magnet assembly
Single Demodulating Ring (SDR) for lower distortion
Weather protected cone and plates for outdoor usage
Suitable for line arrays and compact two way systems
General |
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Product type | Cone driver |
Brand | Eighteen Sound |
Reference | 8NMB420 |
Product code | ALT080420WF08NA - 022088N400 |
Informations |
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Nominal impedance | 8 ohm |
Dimensional category | 8.5 inch |
Frequency coverage type | Midbass, Midrange, High midrange |
Manufacturer sensitivity | 95 dB |
Calculated sensitivity | 95.68 dB |
Nominal power handling | 280 W |
Max power handling | 400 W |
Bandwidth | 60÷5500 Hz |
Fundamental parameters |
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Sd | 230 cm² |
Mms | 14.9 gr |
Cms | 463 µm/N |
Le | 0.35 mH |
Re | 5 ohm |
BL | 10 T.m |
Small signal parameters |
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Fs | 61 Hz |
Qes | 0.31 |
Qms | 4 |
Qts | 0.28 |
Vas | 33 L |
Datas |
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Xmax | ±5.8 mm |
EBP | 197 Hz |
Zmin | 5.9 ohm |
Fs / Qts | 218 Hz |
Vas * Qts² | 2.59 L |
Calculated efficiency | 2.32 % |
Weight | ~1.7 kg |
Dimensions |
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Voice coil diameter | 2 inch |
Outside diameter | 210 mm |
Baffle cutout diameter | 186 mm |
Depth | 99 mm |
Front thickness | 14 mm |
Depth after front | 85 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.