18 Sound 12W700 – Legacy High-Sensitivity 12-Inch Ferrite Woofer with Ribbed Cone and 98 dB Output
The 18 Sound 12W700 is the predecessor to the 12W750 in 18 Sound’s 12-inch ferrite woofer lineage — a driver that brought the linearity, efficiency, and power handling of the 15W700 model into a more compact 300 mm chassis. With a 75 mm ISV voice coil, 98 dB sensitivity — 1 dB above the 12W750 that succeeded it — 450 W AES / 700 W program power handling, and a distinctive ribbed curvilinear cone, the 18 Sound 12W700 remains a high-sensitivity option for compact reflex and band-pass applications, though 18 Sound now points builders toward the 10W650 as the current alternative.
The 98 dB sensitivity is the specification where the 18 Sound 12W700 outperforms its successor. The 12W750 delivers 97 dB from a lighter 57 g moving mass; the 18 Sound 12W700 delivers 98 dB from a heavier 51 g mass and a slightly different motor tune — a genuine sensitivity advantage for builders who prioritise output per watt.
The ribbed curvilinear cone is a construction detail unique to this model among the 12-inch drivers we’ve covered — 18 Sound specifically ribs the cone structure to control bell-mode resonances around the circumference while maintaining the best possible linearity within the driver’s operating range. The cone is carried by the same unusually deep-profile, triple roll polycotton suspension found on the 12W750, engineered for resistance to ageing and fatigue beyond traditional cotton-based surrounds.
18 Sound now lists the 10W650 — a 10-inch driver — as the alternative/current model, a cross-diameter recommendation that signals the 12-inch 700-series platform is being phased out in favour of 18 Sound’s newer 10-inch ferrite offerings rather than a direct 12-inch replacement.
At 8.2 kg — the heaviest 12-inch driver in the range, heavier even than the 12W750 — with weather-protected cone and plates, 55 Hz – 4200 Hz bandwidth, and 8 Ω only availability.
Design and Construction of the 18 Sound 12W700
The 18 Sound 12W700 uses a 75 mm (3-inch) aluminium ISV (Interleaved Sandwich Voice Coil) wound on a high-strength fibreglass former — carrying windings on both outer and inner surfaces to achieve the mass-balanced coil that produces 18 Sound’s characteristic linear motor assembly with reduced eccentric behaviour under hard driving.
The magnetic structure has been optimised using FEA CAD resource to maximise flux density in the voice coil gap. The 17.7 Tm force factor driving 51 g of moving mass produces 98 dB sensitivity — the highest of any 18 Sound 12-inch ferrite driver we’ve covered — and the 0.36 Qts / 156 Hz EBP that define a considerably more flexible enclosure alignment than the 12W750’s 0.28 Qts. This higher Qts places the 18 Sound 12W700 closer to the sealed/vented boundary, giving builders more freedom in enclosure topology than the more strictly vented-oriented 12W750.
The ribbed curvilinear cone is made from special high-strength wood pulp designed for the best possible linearity within the intended frequency range and to control bell-mode resonances around the cone circumference — the ribbing adds structural stiffness at targeted points on the cone surface, a construction refinement not carried over to the 12W750.
The cone is carried by an unusually deep-profile triple roll suspension made from polycotton material more resistant to ageing and fatigue than traditional cotton-based surrounds — identical suspension technology to the 12W750, supporting the 6.5 mm Xmax.
Voice coil cooling uses airways between the chassis back plate and the top plate of the magnet, channelling heated air from the voice coil and gap away for dissipation through the chassis basket. 18 Sound specifically credits an improved heat dissipation basket design as a feature of the 18 Sound 12W700. An exclusive cone and magnet plate treatment process increases corrosion resistance and renders the cone water repellent for outdoor and high-humidity performance.
The 1.48 mH Le is higher than the 12W750’s 0.95 mH — without SDR or copper ring compensation, this is the trade-off for the driver’s motor tune. At 8.2 kg, 315 mm overall diameter, 282 mm baffle cutout, 147 mm depth, and 16 mm flange, the 18 Sound 12W700 is 700 g heavier than the 12W750 despite the lighter 51 g moving mass — a larger overall chassis and thicker flange account for the difference.
Performance and Applications for the 18 Sound 12W700
The 18 Sound 12W700 delivers 98 dB sensitivity across a 55 Hz – 4200 Hz bandwidth. The 450 W AES / 700 W continuous program power handling is lower than the 12W750’s 600 W AES / 1200 W, but the 1 dB sensitivity advantage narrows the gap in practical maximum output.
18 Sound recommends a 70-litre (2.47 ft³) vented enclosure tuned to 60 Hz — a larger cabinet than the 12W750’s 60-litre recommendation, reflecting the different Qts alignment. 18 Sound describes the 18 Sound 12W700 as ideal for compact two-way, multiway systems, and subwoofer applications — the same broad application range as the 12W750.
The 0.36 Qts gives the 18 Sound 12W700 more enclosure flexibility than the 12W750’s 0.28 Qts — sealed enclosure designs are more viable with this alignment, producing tighter, more controlled bass with a gentler rolloff, while vented designs still extend the low end effectively.
The comparison to the 12W750 gives builders clear decision criteria. The 12W750 delivers more power handling (600 vs 450 W AES), more Xmax (8.0 vs 6.5 mm), lower inductance (0.95 vs 1.48 mH), and triple impedance availability (4/8/16 vs 8 Ω only). The 18 Sound 12W700 delivers 1 dB more sensitivity (98 vs 97 dB) and more enclosure flexibility (0.36 vs 0.28 Qts). For most new builds, the 12W750’s broader impedance options and higher power handling make it the stronger current specification — which is reflected in 18 Sound’s own alternative model listings.
Conclusion – 18 Sound 12W700 Woofer
The 18 Sound 12W700 is the legacy high-sensitivity option in 18 Sound’s 12-inch ferrite woofer lineage — 98 dB from a ribbed curvilinear cone and 75 mm ISV coil, with a more flexible 0.36 Qts than its 12W750 successor. The trade-offs are lower power handling (450 vs 600 W AES), less Xmax (6.5 vs 8.0 mm), higher inductance (1.48 vs 0.95 mH), and single 8 Ω availability only.
18 Sound now points builders toward the 10W650 as the current alternative — a cross-diameter recommendation suggesting the 12-inch 700-series is being retired in favour of the company’s newer 10-inch ferrite platform rather than continuing within the 12-inch format. For replacement of existing 18 Sound 12W700 installations or applications where the specific 98 dB sensitivity and 0.36 Qts flexibility are required, the driver remains a capable, weather-protected 12-inch ferrite woofer.
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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.
