18 Sound ND1P – Super Compact Pure PEN Diaphragm Driver with 20 kGauss Ring Magnet
The 18 Sound ND1P is a 1-inch exit neodymium high-frequency compression driver specifically designed for high-quality applications. Marketed with a “super compact design” as its headline feature, the 18 Sound ND1P shares the 20 kGauss ring magnet documented on the ND1085 and ND1090, but packages it into a genuinely smaller 85 mm × 46 mm chassis — more compact than either of those siblings.
The pure PEN diaphragm assembly exhibits a constant slope response from 1.5 kHz to 18 kHz with uniform smooth roll-off behaviour — a “pure PEN” construction distinct from the titanium-on-PEN-suspension hybrid documented on the ND1090, more directly comparable to the treated-polyethylene-only construction found on the ND1020 and ND1085.
Equipped with proprietary phase plug architecture, the 18 Sound ND1P has been developed to give high-level manufacturing consistency and a smooth coherent wavefront at the horn entrance over all the working frequency range. This phase plug design, with its short openings and high flare rate value, assures low distortion and remarkable improvements in mid-high frequency reproduction.
Design and Construction of the 18 Sound ND1P
An edge-wound aluminium voice coil, wound on proprietary treated Nomex, completes the diaphragm assembly. Thanks to its physical properties, the proprietary treated Nomex former shows a 30% higher value of tensile elongation at working operative temperature (200°C) when compared to Kapton — the consistent figure documented throughout this session’s entire compression driver range.
A copper ring on the pole piece reduces inductance above 10 kHz, improving phase and impedance linearisation — matching the identical specific benefit documented on the ND1085 and ND1090.
The ability to perform properly under inclement weather conditions is a key point of 18 Sound’s philosophy. 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 than any other treatment used by any other manufacturer.
At 0.9 kg, 85 mm overall diameter, and 46 mm depth, the 18 Sound ND1P is notably more compact than both the ND1085 (1.1 kg, 92 mm) and ND1090 (1.1 kg, 93 mm), despite sharing the identical 20 kGauss ring magnet flux density — confirming genuine chassis miniaturisation in this specific model.
Performance and Applications for the 18 Sound ND1P
The 18 Sound ND1P delivers 109 dB sensitivity across a 1.6 – 18 kHz frequency range, with a recommended crossover of 1.6 kHz using a 12 dB/octave or steeper high-pass filter — matching the ND1085’s sensitivity figure exactly, from a genuinely smaller and lighter chassis.
The 50 W AES / 100 W continuous power handling exceeds the ND1085’s 80 W, matching the ND1090’s power class from this more compact platform. Available in both 8 and 16 Ω, the 18 Sound ND1P provides system design flexibility matching its ring-magnet siblings.
For applications where minimum size and weight matter alongside the full power handling and sensitivity of 18 Sound’s ring-magnet generation, the 18 Sound ND1P delivers a genuinely space-efficient alternative within this closely related driver family.
Conclusion – 18 Sound ND1P Compression Driver
The 18 Sound ND1P brings the 20 kGauss ring magnet technology documented on the ND1085/ND1090 into 18 Sound’s most compact chassis within this specific driver family — a pure PEN diaphragm delivering 109 dB sensitivity and full 100 W power handling from just 0.9 kg and an 85 mm × 46 mm footprint.
This completes an exceptionally comprehensive exploration of 18 Sound’s entire 1-inch compression driver range across this session — from the ferrite HD1000/HD1030/HD1040/HD1050/HD110/HD125 family through the elementary-piece neodymium ND1018BT/ND1020/ND1030/ND1060/ND1070/ND1075 trio, to the ring-magnet ND1085/ND1090/ND1050/18 Sound ND1P generation, closing out this session’s full review of 18 Sound’s entire compression driver catalogue spanning every throat size from 0.75 through 3 inches.
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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.
