Eighteen Sound |
12NMB420 |
12NMB420-8 |
ALT120420WF08NA - 022128N310 |
Cone driver |
Sold by piece |
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Brand Eighteen Sound |
Model 12NMB420 |
TLHP code 12NMB420-8 |
Manufacturer code ALT120420WF08NA - 022128N310 |
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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
The 12NMB420 is a 12 inch neodymium midbass transducer designed for professional monitoring and sound reinforcement. At the heart of this speaker is a carefully engineered drive system, designed to assure linear, low-distortion output, high power capability and efficient heat transfer.
The most extended bass, lowest distortion and best control is usually realized in properly designed vented enclosures. In such designs, the vent, or port, actually provides the lowest octave of output. The excursion of the 12NMB420 at these frequencies is much reduced compared to sealed enclosures, directly reducing harmonic distortion and the possibility of speaker bottoming. Typical vented enclosure sizes range from 40lit up with tunings from 50 to 60Hz. Low frequency equalization is suggested and normally added, in order to improve the bass output if the system will work without subwoofer.
The recommended amplifier size ranges from 250-500W. The onboard copper sleeve positioned in the gap and coupled with SDR (Single Demodulating Ring) results in optimum balance for reproducing instantaneous peaks on mid frequencies, reducing intermodulation distortion. The external magnet typology neodymium magnet assembly assures high flux concentration, low power compression and excellent heat exchange since the external magnet configuration is considerably more efficient than the traditional under - pole magnet topology.
This allows to obtain high levels of force factor and power handling with a power to weight ratio at the upper level. The high quality paper cone has a smooth, curvilinear profile design that eliminates bell-mode resonances within the intended frequency range. This is carried by a specially treated and damped double triple-roll linen suspension designed to control excursion maintaining the piston action linearity.
The 12NMB420 employs a 64mm Interleaved Sandwich Voice coil (ISV), in which a high strength fiberglass former carries windings on both the outer and inner surfaces to achieve a mass balanced coil, resulting in an extremely linear motor assembly with reduced tendency to eccentric behavior when driven hard.
100,5 dB SPL 1W / 1m average sensitivity
65 mm (2,5 in) Interleaved Sandwich Voice coil (ISV)
300 W AES power handling
External neodymium magnet assembly
Single Demodulating Ring (SDR) for ultra low distortion
Weather protected cone and plates for outdoor usage
Specially designed for compact two way systems
General |
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Product type | Cone driver |
Brand | Eighteen Sound |
Reference | 12NMB420 |
Product code | ALT120420WF08NA - 022128N310 |
Informations |
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Nominal impedance | 8 ohm |
Dimensional category | 12.5 inch |
Frequency coverage type | Low, Midbass, Midrange |
Manufacturer sensitivity | 100.5 dB |
Calculated sensitivity | 99.01 dB |
Nominal power handling | 300 W |
Max power handling | 450 W |
Bandwidth | 55÷6000 Hz |
Fundamental parameters |
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Sd | 531 cm² |
Mms | 33.5 gr |
Cms | 273 µm/N |
Le | 0.2 mH |
Re | 5.2 ohm |
BL | 13.9 T.m |
Small signal parameters |
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Fs | 53 Hz |
Qes | 0.3 |
Qms | 3.6 |
Qts | 0.28 |
Vas | 105 L |
Datas |
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Xmax | ±4 mm |
EBP | 177 Hz |
Zmin | 6.9 ohm |
Fs / Qts | 189 Hz |
Vas * Qts² | 8.24 L |
Calculated efficiency | 5.01 % |
Weight | ~2.8 kg |
Dimensions |
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Voice coil diameter | 2.5 inch |
Outside diameter | 315 mm |
Baffle cutout diameter | 282 mm |
Depth | 127 mm |
Front thickness | 11 mm |
Depth after front | 116 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.