• Speaker 18Sound 6" 6NMB420
High Output MB Neodymium Transducer

Key Features

  • 100 dB SPL 1W / 1m average sensitivity 
  • 44 mm (1 3/4 in) voice coil
  • 200 W AES power handling 
  • External neodymium magnet assembly
  • Single Demodulating Ring (SDR) for lower distortion
  • Weather protected cone and plates for outdoor usage
  • Improved heat dissipation via Active Cooling System
  • Specially designed for line arrays and compact two way 


The 6NMB420 is a 44mm voice coil 6.5 inch neodymium midbass transducer designed for mid low frequency reproduction in system designs where high intelligibility is required.
When compared to our 6ND410 state-of-the-art midrange transducer, 6NMB420 offers a lower frequency resonance and a longer linear Xmax value. As a result the speaker shows an increased output around 250Hz, with a consequent slightly reduced output above 700Hz.
It is suitable as mid-bass in line array systems or multiple way systems with high-pass crossover above 200 Hz and low-pass up to 3kHz; enclosure might be closed or vented with volume size starting from 2 lit.
The speaker offers a superb linearity: distortion values are furtherly minimized by new enhanced design criterias, developed by Eighteen Sound engineers, taking the 6NMB420 to very high level of performance.
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.
A consistent heat transfer is guaranteed by the encapsulation of the magnetic structure in the interior of the basket, offering a largecontact space between the back plate and the dissipating structure.
Particular efforts were dedicated to the surround shape and material design in order to minimize the resonances on mid range frequencies. The triple roll design offers a consistent damping to typical bell modes.
The 44 mm voice coil is made of light-weight aluminum wire and assures linearity and high power handling.
The ability to perform in humid environments is a key feature of the 6NMB420: this is achieved through a proprietary humidity repellent cone treatment

General Specifications

Nominal Diameter152mm (6 in)
Rated Impedance8 Ohm
AES Power200 W
Program Power260 W
Peak Power500 W
Sensitivity100 dB
Frequency Range200 ÷ 7000 Hz
Power Compression @-10dB0,9 dB
Power Compression @-3dB1,6 dB
Power Compression @Full Power2,9 dB
Max Recomm. Frequency3500 Hz
Recomm. Enclosure Volume2 ÷ 6 lt. (0,07 ÷ 0,21 cuft)
Minimum Impedance6,2 Ohm at 25°C
Max Peak To Peak Excursion14 mm (0,55 in)
Voice Coil Diameter44 mm (1,75 in)
Voice Coil Winding Materialaluminum
SuspensionTriple Roll, Polycotton
ConeCurvilinear, Paper

Thiele Small Parameters

Fs110 Hz
Re5,3 Ohm
Sd0,013 sq.mt. (20,15 sq.in.)
Vas6,1 lt. (0,22 cuft)
Mms8,5 gr. (18,76 lb)
BL9 Tm
Linear Mathematical Xmax± 3 mm (±0,12 in)
Le (1kHz)0,1 mH
Ref. Efficiency 1W@1m (half space)95,1 dB

Mounting information

Overall diameter162 mm (6,38 in)
N. of mounting holes and bolt4
Mounting holes diameter5,5 mm (0,22 in)
Bolt circle diameter170 mm (6,69 in)
Front mount baffle cutout ø148 mm (5,38 in)
Rear mount baffle cutout ø148 mm (5,38 in)
Total depth73 mm (2,87 in)
Flange and gasket thickness11,5 mm (0,45 in)
Net weight1,25 kg (2,75 lb)
Shipping weight1,45 kg (3,19 lb)
CardBoard Packaging dimensions170 x 170 x 80 mm (6,69 x 6,69 x 3,15 in)

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Speaker 18Sound 6" 6NMB420

  • Brand: 18Sound
  • Product Code: 6NMB420
  • Availability: In Stock
  • $35,532
  • $31,979

  • CTC Sale Vat Incl.

Tags: 6NMB420 speaker