18 Sound NSD1095N compression driver, 8 ohm, 1 inch exit

The NSD1095N 1 inch exit neodymiumcompression driver has been designed forsituations where the highest quality is required.

Equipped with proprietary phase plug architecture, the NSD1095N has been designed to give a smooth coherent wavefront at the horn entrance across the whole workingfrequency range. The phase plugshort openings and high flare rate value assure low distortion and overall, thiskind of phase plug demonstratesremarkable improvementsinmid-high frequency reproduction. A furtherinnovation in the NSD1095N isthe titaniumdiaphragmnitrogen treatment, a proprietary technology defined as True Piston Motion - TPM technology developed after extensive research by Eighteen Sound. The coatingis realized in a PVD - Physical Vapor Deposition -vacuumchamber.With itsvery high value of elasticity modulus(sixtimes higherthan titaniumand two times higherthan beryllium), the nitride thin filmiscapable of doublingthe diaphragmoverallstiffness with obvious benefitsin terms of impulse response and intermodulation distortion reduction. The frequency response is then extended by 25%,showing a predictable, ideal pistonic behavior, avoidingtop-end spuriousresonances. An edge-wound copper-clad aluminumvoice coil, wound on proprietary treated Nomex,completesthe diaphragmassembly. Nomexshows a 30% highervalue of tensile elongation at a working operative temperature (200°C) when compared to Kapton. Moreover, this proprietary formermaterial is also suitable for use in highmoisture content environments.
The powerful neodymiummagnet assembly has been designed to obtain 20KGaussin the gap givingmajor benefitsin transient response. A copperring on the pole piece reducesinductance above 10 kHz, improving phase and impedance linearization. The customdesigned O-ring creates a tight seal between the plate and the cover assuring airchamberloading. Excellent heat dissipation and thermal exchange are guaranteed by the direct contact between themagnetic structure and the aluminumcover which leadsto a lower powercompression value. A special treatment has been applied to themagnet and the top and back plates of themagnetic structuremakingthe drivermore resistant to the corrosive effects ofsalts and oxidization.