18 Sound ND3T – Standard Titanium Baseline Completing the Ultra Compact 109mm Family
The 18 Sound ND3T 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 standard titanium reference point that the ND3A explicitly cited when describing its own lower crossover point (“when compared to the titanium version”), and the fifth complete diaphragm material variant documented sharing this exact ultra-compact chassis platform.
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. In comparison with a usual straight former joint, the driver’s design assures extended frequency energy transfer for improved response linearity and unparalleled reliability, facilitating proper motion control of the dome in real working conditions.
Despite its compact size, the ND3T neodymium magnet assembly has been designed to obtain 20 kGauss in the gap for major benefits in transient response — matching every other driver in this chassis family (ND3A, ND3BE, ND3G, ND3N) precisely.
Design and Construction of the 18 Sound ND3T
A proprietary treated Nomex former is used, carrying the same 30% higher tensile elongation figure versus Kapton documented consistently across 18 Sound’s entire HF range, suitable for use in higher moisture content environments.
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 ND3T matches every other driver in this ultra-compact chassis family precisely.
Performance and Applications for the 18 Sound ND3T
The 18 Sound ND3T 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 family on sensitivity, with 220 W continuous power handling matching the ND3A and glass ND3G, exceeding the beryllium ND3BE’s 180 W.
This now completes the full five-member diaphragm material comparison within 18 Sound’s ultra-compact 109 mm chassis family, all documented across this session: standard titanium (18 Sound ND3T), aluminium-PEN (ND3A), pure beryllium (ND3BE), glass (ND3G), and TPM nitride-coated titanium (ND3N) — five distinct diaphragm technologies sharing an identical 20 kGauss neodymium ring magnet, next-gen 4-slot phase plug, and self-centering d-kit chassis platform.
Conclusion – 18 Sound ND3T Compression Driver
The 18 Sound ND3T is the standard titanium baseline within 18 Sound’s ultra-compact 109 mm compression driver chassis family — the reference point that its aluminium-PEN, beryllium, glass, and TPM-coated siblings all measure themselves against. This closes out an exceptionally comprehensive exploration of 18 Sound’s complete 1.4-inch compression driver catalogue across both chassis sizes documented in this session: five variants at 109 mm and three variants at 120 mm, spanning every major diaphragm material and technology 18 Sound currently produces at this throat size.
For applications requiring 18 Sound’s proven titanium technology within the smallest available chassis footprint, the 18 Sound ND3T delivers the platform reference specification.
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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.
