18 Sound NSD1480N – TPM Nitride Titanium Completing the Ring-Magnet 1.4-Inch Family
The 18 Sound NSD1480N 1.4-inch exit, 3-inch voice coil neodymium compression driver has been designed for top quality sound systems applications. A great innovation in the 18 Sound NSD1480N is the titanium nitride coated dome — so-called TPM True Piston Motion technology — that dramatically improves stiffness with obvious benefits in transient and intermodulation distortion response. This shares the exact 75 mm coil and 22 kGauss ring magnet platform documented on the ND1460, ND1460A, ND1480, ND1480A, and ND1480BE — completing the sixth diaphragm material variant within this closely related family.
With its very high value of elasticity modulus — six times higher than titanium and two times higher than beryllium — the nitride-coated film is capable of doubling the titanium stiffness, matching the identical figures documented on the NSD1424BTN’s smaller-coil sibling. The piston frequency range motion extends frequency by 25%, showing a predictable, ideal frequency response decay and avoiding top-end spurious resonances.
The nitride-free ellipsoidal suspension shape has been designed to maintain constant titanium stiffness, assuring a 3rd harmonic distortion lower than 0.05% over the whole working frequency range — the identical suspension engineering approach documented on the NSD4015N, applying nitride coating specifically to the dome while keeping the suspension itself untreated for a deliberate, complementary stiffness balance.
Design and Construction of the 18 Sound NSD1480N
The titanium diaphragm is produced in-house and has been developed to assure unmatched transient response. The diaphragm assembly is made by joining the former directly to the titanium dome on its upper bend edge — extended frequency energy transfer for improved response linearity and unparalleled reliability, allowing proper motion control of the dome in real working conditions.
The 18 Sound NSD1480N powerful neodymium magnet assembly has been designed to obtain 22 kGauss in the gap for major benefits in transient response — matching the ND1480/ND1480A/ND1480BE ring magnet exactly. The motor structure, through the precisely coherent phase plug with 3 circumferential slots and copper ring on the pole piece, reduces inductance effect and distortion.
Four top plate air ducts have been designed to act as a loading chamber for the diaphragm, implementing mid-band distortion and response figures. The custom designed O-ring creates a tight seal between the plate and the cover, assuring air chamber loading. Excellent heat dissipation and thermal exchange are guaranteed by the direct contact between the magnetic structure and the aluminium cover, which gives a lower power compression value.
A special treatment is applied to the magnet and the top and back plates of the magnetic structure, making the driver more resistant to the corrosive effects of salts and oxidisation. At 3.1 kg, 131 mm overall diameter, and 62 mm depth, the 18 Sound NSD1480N matches the physical footprint of the ND1480/ND1480A/ND1480BE precisely.
Performance and Applications for the 18 Sound NSD1480N
The 18 Sound NSD1480N delivers 111 dB sensitivity across a 0.5 – 20 kHz frequency range, with a recommended crossover of 0.8 kHz using a 12 dB/octave or steeper high-pass filter — 1 dB below the ND1480/ND1480BE’s 112 dB, but with matching 200 W continuous power handling and the lowest available 0.8 kHz crossover point within this family.
This completes the full six-driver comparison within 18 Sound’s ring-magnet 1.4-inch family documented across this session: the standard titanium ND1460, aluminium-PEN ND1460A, ring-magnet titanium ND1480, ring-magnet aluminium-PEN ND1480A, pure beryllium ND1480BE, and the TPM nitride-coated 18 Sound NSD1480N documented here — six distinct diaphragm technologies sharing closely related magnetic architectures and chassis footprints.
For applications where minimising harmonic distortion (sub-0.05% third harmonic) is the paramount requirement while retaining full 200 W power handling, the 18 Sound NSD1480N delivers 18 Sound’s most distortion-optimised choice within this specific family.
Conclusion – 18 Sound NSD1480N Compression Driver
The 18 Sound NSD1480N brings TPM nitride-coated titanium technology to 18 Sound’s ring-magnet 1.4-inch family, completing this session’s exploration of six distinct diaphragm material variants sharing the 75 mm coil and 22 kGauss magnetic architecture platform. The nitride coating’s remarkable elasticity advantage — genuinely exceeding beryllium per 18 Sound’s own figures — combined with the nitride-free ellipsoidal suspension delivers the sub-0.05% third harmonic distortion specification documented consistently across 18 Sound’s TPM range.
This closes out an exceptionally comprehensive exploration of 18 Sound’s complete compression driver catalogue across every throat size, chassis platform, magnet material, and diaphragm technology documented throughout this session.
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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.
