18 Sound 6NMB420 Mid-Bass Speaker

Key features

• 100 dB SPL 1W / 1m average sensitivity
• 44 mm (1 3/4 in) voice coil
• 200 W continuous pink noise power handling
• External neodymium magnet assembly
• Single Demodulating Rings (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 systems

Description

The 6NMB420 is a neodymium midbass transducer designed for low frequency reproduction in 3-way systems or multiway systems where both low weight and high intelligibility are required.
When compared to our 6ND410 state-of-the-art midrange transducer, 6NMB420 offers a lower frequency resonance and a longer linear Xmax value; this drives to an increased output around 250Hz, with a consequent slightly reduced output above 700Hz.
It is suitable as mid-bass in 3 way 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 large contact 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 45 mm voice coil is made of light-weight aluminum wire and assures linearity and high power handling.
Thanks to the increasing use during outdoor audio events, the ability to perform in humid environments is a key feature of the 6NMB420. This is achieved trough an exclusively developed cone treatment which render the cone humidity repellent while it does not increase total moving mass.