Eighteen Sound 10NMB420 High Output MB Neodymium Transducer
The 10NMB420 neodymium transducer has been developed in response to a specific market requirement for a 10" midbass driver that combines excellent linearity with good efficiency and high power handling capabilities. The 10NMB420 is primarily intended for use as a midbass driver in line-arrays as well as high quality 2-way or multiway reflex enclosures. The low pass filter might be positioned as high as 2000Hz. 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.
Features
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99 dB SPL 1W / 1m average sensitivity
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65 mm (2.5 in) Interleaved Sandwich Voice coil (ISV)
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350 W AES power handling
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External neodymium magnet assembly
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Single Demodulating Ring (SDR) for lower distortion
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Weather protected cone and plates for outdoor usage
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Suitable for line arrays and compact two way systems
The 65mm Ø state-of-the-art, aluminum wire 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, in order 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 BL force factor. The voice coil is cooled through airways placed between the chassis back plate and the magnet faceplate. In this way heated air is channeled away from the voice coil and the gap. Another technology present into the 10NMB420 is the SDR (Single Demodulating Ring), used to reproduce instantaneous peak on mid frequencies, reducing intermodulation distortion. Thanks to the increasing use during outdoor audio events, the ability to perform in humid environments is an extra key feature of the 10NMB420. This is achieved trough an exclusively developed cone treatment which renders the cone humidity repellent while does not increasing the total moving speaker mass.
Specifications
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Nominal Diameter 260 mm ( in)

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Nominal Impedance 8 Ω

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Minimum Impedance 7.0 Ω
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Nominal Power Handling1 350 W

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Continuous Power Handling2 500 W

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Sensitivity3 99.0 dB

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Frequency Range 65 - 5000 Hz

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Voice Coil Diameter 65 mm (2.56 in)

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Winding Material Aluminum
Design
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Recommended Enclosure 25.0 dm3 (0.88 ft3)

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Recommended Tuning 70 Hz
Parameters
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Resonance Frequency 56 Hz

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Re 5.0 Ω

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Qes 0.26 

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Qms 5.0 

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Qts 0.25 

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Vas 40.0 dm3 (1.41 ft3)

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Sd 346.0 cm2 (53.63 in2)

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Xmax 4.0 mm

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Mms 29.5 g

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Bl 14.5 Txm

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Le 0.37 mH

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EBP 215 Hz
Mounting and Shipping Info
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Overall Diameter 260 mm (10.24 in)

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Bolt Circle Diameter 244 mm (9.61 in)

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Baffle Cutout Diameter 232.0 mm (9.13 in)
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Depth 122 mm (4.8 in)
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Flange and Gasket Thickness 11 mm (0.43 in)

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Net Weight 3.0 kg (6.61 lb)

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Shipping Weight 3.4 kg (7.5 lb)

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Shipping Box 275 x 275 x 164 mm (10.83x10.83x6.46 in)
