Eighteen Sound 12NMB420 12" Neodymium Mid-Bass Speaker 450W 8-Ohm Weather Protected Cone

Eighteen Sound 12NMB420 12" Neodymium Mid-Bass Speaker 450W 8-Ohm Weather Protected Cone

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Eighteen Sound 12NMB420 T.C.
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Eighteen Sound 12NMB420 12" Neodymium Mid-Bass Speaker 450 Watts 8-Ohms


  • 100,5 dB SPL 1W / 1m average sensitivity

  • 65 mm (2,5 in) Interleaved Sandwich Voice coil (ISV)

  • 300 W AES power handling

  • Single Demodulating Ring (SDR) for lower distortion

  • External neodymium magnet assembly

  • Weather protected cone and plates for outdoor usage

  • Specially designed for compact two way systems

The 12NMB420 is a 12 inch neodymium mid-bass 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 up to 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.


  • Nominal Diameter: 300 mm (in)

  • Nominal Impedance: 8 Ω

  • Minimum Impedance: 6.9 Ω

  • Nominal Power Handling: 300 W

  • Continuous Power Handling: 450 W

  • Sensitivity: 100.5 dB

  • Frequency Range: 55 - 6000 Hz

  • Voice Coil Diameter: 65 mm (2.5 in)

  • Winding Material: aluminum


  • Resonance Frequency: 53 Hz

  • Re: 5.2 Ω

  • Qes: 0.3

  • Qms: 3.6

  • Qts: 0.28

  • Vas: 105.0 dm3 (3.71 ft3)

  • Sd: 531.0 cm2 (82.31 in2)

  • Xmax: 4.0 mm

  • Mms: 33.5 g

  • Bl: 13.9 Txm

  • Le: 0.2 mH

  • EBP: 176 Hz


  • Surround Shape: Triple roll

  • Cone Shape: Curvilinear

  • Magnet Material: Neo

  • Woofer Cone Treatment: Weather protected

  • Recommended Enclosure: 70.0 dm3 (2.47 ft3)

  • Recommended Tuning: 58 Hz


  • Overall Diameter: 315 mm (12.4 in)

  • Bolt Circle Diameter: 296 mm (11.65 in)

  • Baffle Cutout Diameter: 282.0 mm (11.1 in)

  • Depth: 127 mm (5.0 in)

  • Flange and Gasket Thickness: 11 mm (0.43 in)

  • Net Weight: 3.0 kg (6.61 lb)

  • Shipping Weight: 3.75 kg (8.27 lb)

  • Shipping Box: 332 x 332 x 184 mm (13.07x13.07x7.24 in)

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