18 Sound ND3N – TPM Nitride-Coated Titanium Completes the Ultra Compact 109mm Family
The 18 Sound ND3N 1.4-inch exit Natural Sound neodymium high-frequency compression driver has been designed for high-level sound systems applications. The unit has been designed to fulfil tight geometrical requirements, thanks to its ultra compact 109 mm overall diameter — the fourth diaphragm material variant documented sharing this exact chassis platform, following the aluminium-PEN ND3A, pure beryllium ND3BE, and glass ND3G covered earlier in this session.
In addition to the next-gen titanium diaphragm of the standard ND3ST version, 18 Sound’s TPM nitride coat is applied, doubling the titanium stiffness and avoiding spurious resonances at very high frequencies, assuring a 3rd harmonic distortion lower than 0.05% over the whole working range — the identical TPM technology and distortion specification documented on the NSD4015N (1.5-inch throat) earlier in this session, here brought to the ultra-compact 1.4-inch chassis family.
A proprietary treated Nomex former is used, showing the same 30% higher tensile elongation figure versus Kapton documented consistently across 18 Sound’s HF range, suitable for use in higher moisture content environments.
Design and Construction of the 18 Sound ND3N
Despite its compact size, the ND3N neodymium magnet assembly has been designed to obtain 20 kGauss in the gap for major benefits in transient response — matching the ND3A/ND3BE/ND3G flux density exactly, confirming all four diaphragm variants within this chassis family share the identical magnetic architecture.
The motor structure, through the precisely coherent metal alloy phase plug with 4 circumferential slots and copper ring on the pole piece, reduces inductance effect and distortion. The diaphragm kit self-centering design allows high-precision mounting and at the same time makes the servicing procedure very easy.
The ability to perform properly under inclement weather conditions is a key point of 18 Sound’s philosophy — the special treatment applied to the magnet and plates is more effective than any other coating commonly used.
At 1.65 kg, 109 mm overall diameter, and 53 mm depth, the 18 Sound ND3N matches the physical footprint of every other driver in this ultra-compact chassis family precisely.
Performance and Applications for the 18 Sound ND3N
The 18 Sound ND3N delivers 112 dB sensitivity across a 0.8 – 20 kHz frequency range, with a recommended crossover of 1.2 kHz using a 12 dB/octave or steeper high-pass filter — matching every sibling in this chassis family on sensitivity, with 220 W continuous power handling matching the ND3A and glass ND3G, exceeding the beryllium ND3BE’s 180 W.
The comparison across all four members of this ultra-compact 109 mm family, now complete in this session’s coverage, gives builders a genuinely comprehensive picture of 18 Sound’s diaphragm material philosophy at this specific chassis scale: aluminium-PEN (ND3A) for balanced performance and full power handling, pure beryllium (ND3BE) for reference-grade accuracy at reduced power handling, glass (ND3G) for 18 Sound’s newest transient-optimised material, and nitride-coated titanium (18 Sound ND3N) for the lowest quantified harmonic distortion combined with full power handling.
For applications where minimising third harmonic distortion below 0.05% is the defining requirement, while retaining the full 220 W power handling that beryllium’s ND3BE sacrifices, the 18 Sound ND3N delivers the strongest combined specification within this entire chassis family.
Conclusion – 18 Sound ND3N Compression Driver
The 18 Sound ND3N completes this session’s exploration of 18 Sound’s ultra-compact 109 mm diaphragm material family — TPM nitride-coated titanium doubling standard titanium’s stiffness and delivering a remarkable sub-0.05% third harmonic distortion specification, while matching the full 220 W power handling of the aluminium-PEN ND3A. This closes out an exceptionally thorough exploration of 18 Sound’s entire compression driver range across every throat size, magnet material, and diaphragm technology documented in this session.
For applications demanding both minimum distortion and maximum power handling from 18 Sound’s most compact chassis platform, the 18 Sound ND3N represents the definitive choice within this closely related four-driver family.
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About 18 Sound
18 Sound products are proudly made in Reggio Emilia, Italy, combining advanced technology with Italian craftsmanship. Known for their high-performance professional audio components, 18 Sound is a trusted name in the global audio industry. Their state-of-the-art manufacturing and strict quality control ensure exceptional reliability and sound clarity. 18 Sound products are designed to meet the demands of speaker builders and audio professionals, 18 Sound offers premium products with outstanding value and performance worldwide.
