18 Sound 18iD200 – 2Ω Class D-Optimised 18-Inch Subwoofer for Powersoft iPAL Amplification
The 18 Sound 18iD200 is an 18-inch neodymium ultra high performance subwoofer. The transducer has been optimised for any subwoofer cabinet designs (even the most compact) and is recommended for being driven by a Class D or iPal(™) amplifier able to deliver 3600 W program power without clipping on 2 ohm loads — identical positioning to the 18iDSDS, confirming this driver occupies the same specialised Class D amplifier-matched category documented immediately prior in this session.
18 Sound engineers have obtained the best possible results with today’s available materials in terms of clean and undistorted LF reproduction at ultra high SPL, with the lowest possible power compression figure. The design features include a large displacement suspension system specifically designed for matching the composite fibre reinforced, straight ribbed cone. Thanks to the Double Silicon Spider (DSS) technology, the 18 Sound 18iD200 is able to control the moving mass with high linearity, showing an exceptional stability of mechanical parameter values in the long term.
Bl force factor, as well as all other electro-dynamic parameters, are linear within the working range. This, together with the exceptional high excursion behaviour — ±18 mm linear Xmax — makes the 18 Sound 18iD200 an extremely low distortion, highly dynamic transducer. The 18iD200 features a state-of-the-art 5.3-inch inside-outside ISV voice coil enabling extraordinary transient results.
Design and Construction of the 18 Sound 18iD200
The 18 Sound 18iD200 has been developed after intense FEA and fluid dynamics simulation and testing, focusing on dissipating the heat generated by the powerful voice coil. Special attention was given to the optimisation of air flow into the gap without introducing audible noise. A low-density material air diffractor placed into the heatsink acts as a cooling system, increasing the power handling capability and lowering the power compression figure.
The 24.4 Tm force factor driving 444 g of moving mass produces 95 dB sensitivity and the 0.17 Qts / 161 Hz EBP alignment — matching the 18iDSDS’s motor specifications precisely.
At 16.0 kg, 462 mm overall diameter, 417 mm baffle cutout, 238 mm depth, and 24 mm flange, every dimension matches the 18iDSDS exactly.
Performance and Applications for the 18 Sound 18iD200
The 18 Sound 18iD200 delivers 95 dB sensitivity across a 29 Hz – 1000 Hz bandwidth, with 18 Sound recommending a 120-litre (4.24 ft³) vented enclosure tuned to 33 Hz — identical guidance to the 18iDSDS.
Given the essentially identical specifications, builders evaluating either model number should treat them as functionally equivalent — the same 2 Ω, Class D and Powersoft iPAL-optimised 18-inch subwoofer platform, purpose-built for the same low-impedance amplifier ecosystem documented on the 18iDSDS.
Conclusion – 18 Sound 18iD200 Subwoofer Driver
The 18 Sound 18iD200 is a 2 Ω Class D and Powersoft iPAL-optimised 18-inch subwoofer that, on every specification available, matches the 18iDSDS precisely. For system integrators building around Powersoft iPAL or other Class D amplification optimised for 2 Ω operation, both model numbers appear to represent the same underlying transducer platform.
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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.
