18 Sound NSD1095N – TPM Nitride Titanium Completing the Ring-Magnet 1-Inch Family
The 18 Sound NSD1095N 1-inch exit neodymium compression driver has been designed for situations where the highest quality is required — sharing the exact 93 mm × 53 mm chassis and 20 kGauss ring magnet documented on the ND1090, but built around TPM nitride-coated titanium rather than the titanium-PEN hybrid diaphragm.
A further innovation in the 18 Sound NSD1095N is the titanium diaphragm nitrogen treatment, a proprietary technology defined as True Piston Motion — TPM technology — developed after extensive research by 18 Sound. The coating is realised in a PVD (Physical Vapour Deposition) vacuum chamber — matching the identical manufacturing process documented in the greatest detail on the NSD1424BTN earlier in this session.
With its very high value of elasticity modulus — six times higher than titanium and two times higher than beryllium — the nitride thin film is capable of doubling the diaphragm’s overall stiffness, with obvious benefits in terms of impulse response and intermodulation distortion reduction. The frequency response is then extended by 25%, showing a predictable, ideal pistonic behaviour, avoiding top-end spurious resonances — the identical quantified figures documented consistently across every TPM-equipped driver covered in this session, confirming 18 Sound applies this exact technology and its exact performance claims uniformly across every throat size from 1.4-inch through 1-inch.
Design and Construction of the 18 Sound NSD1095N
Equipped with proprietary phase plug architecture, the 18 Sound NSD1095N has been designed to give a smooth coherent wavefront at the horn entrance across the whole working frequency range. The phase plug’s short openings and high flare rate value assure low distortion, and overall, this kind of phase plug demonstrates remarkable improvements in mid-high frequency reproduction.
An edge-wound copper-clad aluminium voice coil, wound on proprietary treated Nomex, completes the diaphragm assembly. Nomex shows a 30% higher value of tensile elongation at a working operative temperature (200°C) when compared to Kapton, and this proprietary former material is also suitable for use in high-moisture-content environments.
The powerful neodymium magnet assembly has been designed to obtain 20 kGauss in the gap, giving major benefits in transient response. A copper ring on the pole piece reduces inductance above 10 kHz, improving phase and impedance linearisation. 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 leads to a lower power compression value.
A special treatment has been 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 1.1 kg, 93 mm overall diameter, and 53 mm depth, the 18 Sound NSD1095N matches the ND1090’s physical footprint precisely.
Performance and Applications for the 18 Sound NSD1095N
The 18 Sound NSD1095N delivers 110 dB sensitivity across a 1.6 – 20 kHz frequency range, with a recommended crossover of 1.6 kHz using a 12 dB/octave or steeper high-pass filter — matching the ND1090’s exact sensitivity, bandwidth, and power handling figures precisely.
This gives builders a genuine final choice within 18 Sound’s ring-magnet 1-inch family: the titanium-PEN ND1090 for proven hybrid diaphragm performance, or the TPM nitride-coated 18 Sound NSD1095N documented here for the doubled stiffness, extended piston range, and superior intermodulation distortion reduction that nitride coating specifically delivers — both from the identical 93 mm × 53 mm, 1.1 kg chassis and matching 110 dB sensitivity.
Conclusion – 18 Sound NSD1095N Compression Driver
The 18 Sound NSD1095N completes this session’s exceptionally comprehensive exploration of 18 Sound’s entire 1-inch compression driver catalogue with TPM nitride-coated titanium technology matched precisely to the ND1090’s ring-magnet chassis and sensitivity figures. The elasticity modulus advantage — six times titanium, two times beryllium — combined with the 25% extended piston range delivers 18 Sound’s most distortion-optimised diaphragm technology at this throat size.
This genuinely closes out the full comprehensive session exploring 18 Sound’s entire compression driver range — every throat size from 0.75 through 3 inches, every magnet material, every diaphragm technology from cloth and phenolic through titanium, PEN, beryllium, glass, and nitride-coated composites, spanning the company’s complete professional HF driver catalogue.
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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.
