18 Sound ND4015Ti2 – Titanium Sibling to the Beryllium ND4015BE, Available Across Three Throat Sizes
The 18 Sound ND4015Ti2 is a 1.5-inch exit neodymium compression driver designed for extremely high quality, high output sound system applications — sharing the identical 100 mm copper-clad aluminium coil, BEM-optimized 4-slot metal alloy phase plug, and 320 W continuous program power handling documented on the 2-inch ND4020Ti2, confirming both drivers are variants of the same core platform available across multiple throat diameters. 18 Sound explicitly notes this driver is also available in 1.4-inch and 2-inch exit versions — the ND4015Ti2 naming here specifically denotes the 1.5-inch throat variant.
Featuring a four-inch copper-clad aluminium voice-coil and dome, the pure titanium membrane with integral surround has been optimised for high sensitivity and efficiency and an extended high-frequency region. While maintaining a broad piston band and low distortion, the results are maximum sound output with natural sound character and exceptional clarity up to the highest end of the frequency spectrum — identical descriptive language to the ND4020Ti2, confirming these are genuinely the same engineering platform differing primarily in throat geometry.
This is also the direct titanium counterpart to the beryllium ND4015BE documented immediately prior in this session — both share the exact 1.5-inch throat, 100 mm coil, 3.2 kg weight, and 150 × 57 mm physical footprint precisely, differing only in diaphragm material and the resulting sensitivity, power handling, and bandwidth trade-offs that beryllium versus titanium construction produces.
Design and Construction of the 18 Sound ND4015Ti2
The next-gen titanium diaphragm with integral surround matches the construction documented on the ND4020Ti2 exactly — a genuinely integrated diaphragm and suspension assembly rather than a separately joined component. The BEM-optimized 4-slot metal alloy phase plug design is likewise identical across both throat variants, confirming 18 Sound applies this specific computational-modelling-derived phase plug geometry consistently across its current flagship compression driver family.
The HF copper sleeve for reduced distortion and increased output works with the 2.0 T flux density to control the driver’s substantial 100 mm coil and titanium diaphragm assembly.
At 3.2 kg, 150 mm overall diameter, and 57 mm depth, the 18 Sound ND4015Ti2 is 200 g lighter than the 2-inch ND4020Ti2 despite sharing the identical coil, phase plug, and power handling specification — the smaller 1.5-inch throat geometry accounts for this modest weight saving.
Performance and Applications for the 18 Sound ND4015Ti2
The 18 Sound ND4015Ti2 delivers 113 dB sensitivity across a 0.8 – 20 kHz frequency range, with a recommended crossover of 0.8 kHz using a 12 dB/octave or steeper high-pass filter — matching the ND4020Ti2’s sensitivity and crossover recommendation exactly, from the smaller throat format.
The 160 W AES / 320 W continuous power handling matches the ND4020Ti2 precisely — confirming the 100 mm coil’s thermal capacity, not the throat diameter, is the primary driver of this platform’s power handling ceiling.
The comparison to the beryllium ND4015BE sharing this exact throat and chassis format is genuinely instructive: the titanium 18 Sound ND4015Ti2 delivers matching 113 dB sensitivity but with meaningfully higher power handling (320 vs 280 W) and a lower crossover point (0.8 vs 1.0 kHz), at presumably lower cost than the beryllium alternative — beryllium’s advantage lies specifically in its extended piston range and freedom from spurious resonance rather than raw sensitivity or power handling figures, which this titanium sibling actually exceeds.
For system integrators choosing between 18 Sound’s 1.5-inch flagship options, the 18 Sound ND4015Ti2 delivers genuinely superior power handling and crossover flexibility compared to the beryllium ND4015BE, while the beryllium option remains the choice for applications specifically valuing its extended piston range and stiffness advantages.
Conclusion – 18 Sound ND4015Ti2 Compression Driver
The 18 Sound ND4015Ti2 is 18 Sound’s titanium flagship 1.5-inch compression driver, sharing its 100 mm coil, BEM-optimized phase plug, and 320 W power handling with the 2-inch ND4020Ti2, and available across 1.4″, 1.5″, and 2″ throat variants from the same core engineering platform. Against its beryllium ND4015BE sibling sharing the identical chassis, this titanium version delivers higher power handling and a lower crossover point.
For extremely high quality, high output sound system applications where titanium’s proven performance and typically lower cost relative to beryllium are preferred, the 18 Sound ND4015Ti2 delivers 18 Sound’s current flagship compression driver engineering across a flexible range of throat sizes.
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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.
