18 Sound 10MB777 – High-Power Ferrite 10-Inch Mid-Bass Developed from the 10M600 Midrange Platform
The 18 Sound 10MB777 is a high-power ferrite 10-inch mid-bass driver developed directly from the 10M600 midrange — combining that platform’s motor linearity with higher efficiency and higher power handling optimised for extremely compact two-way reflex enclosures between 10 and 40 litres. With a 75 mm ISV voice coil, 18.6 Tm force factor, 98 dB sensitivity, and 450 W AES / 700 W continuous program power handling, the 18 Sound 10MB777 delivers ferrite-motor output that rivals the neodymium range from a driver built on 18 Sound’s most refined 10-inch midrange chassis.
The 75 mm ISV coil is the same coil platform found on 18 Sound’s top-of-the-range 15 and 18-inch models, wound with aluminium wire rather than the copper used on some of the smaller-format ISV drivers. The mass-balanced, inside/outside wound construction produces an extremely linear motor assembly with reduced eccentric behaviour when driven hard — the same engineering standard 18 Sound applies across its largest professional drivers, scaled down to the 10-inch format.
The 98 dB sensitivity matches the highest neodymium ISV/SDR figure in the 10-inch range (10NMB420) from a ferrite motor — a genuinely competitive output-per-watt figure for a driver that avoids the neodymium cost premium. The 450 W AES power handling is the highest of any ferrite 10-inch mid-bass in 18 Sound’s catalogue, exceeding the 10W650’s 250 W and the 10W500’s 280 W by wide margins.
18 Sound intends the 18 Sound 10MB777 primarily as a mid-bass driver in extremely compact two-way reflex enclosures. At 7.2 kg — the heaviest ferrite 10-inch in the range — with weather-protected cone treatment and corrosion-resistant plate coatings. Limited distribution U.S. only through Thunderball Marketing. 18 Sound lists the 10NMB420 as the alternative/current model.
Design and Construction of the 18 Sound 10MB777
The 18 Sound 10MB777 uses a 75 mm (3-inch) aluminium ISV (Interleaved Sandwich Voice Coil) — the same coil diameter fitted to 18 Sound’s flagship 15 and 18-inch drivers, here wound with aluminium rather than the copper found on some other 75 mm applications. A high-strength fibreglass former carries windings on both the outer and inner surfaces to achieve a mass-balanced coil, producing an extremely linear motor assembly with reduced tendency toward eccentric behaviour under hard driving.
The 18.6 Tm force factor driving 38 g of moving mass produces 98 dB sensitivity and the 0.22 Qts / 252 Hz EBP that define a strongly motor-dominant mid-bass alignment. The curvilinear paper cone is formed using a special high-strength wood pulp designed for maximum rigidity and stiffness, with an exclusive treatment applied to increase water repellency.
Voice coil cooling uses airways between the chassis back plate and the magnet face plate, channelling heated air from the coil and gap away for dissipation through the chassis basket — a cooling architecture 18 Sound developed using 3D CAD resource application. The top and back plates of the magnet assembly were designed using in-house FEA CAD to optimise flux density and Bl factor in the air gap. A special treatment applied to both plates makes the transducer far more resistant to the corrosive effects of salts and oxidisation, enabling reliable outdoor performance in inclement weather.
The M-roll surround provides controlled compliance through the 6.5 mm Xmax — more excursion than the 10NMB420’s 4 mm, positioning the 18 Sound 10MB777 for genuine mid-bass displacement rather than pure midrange sensitivity.
The 1.6 mH Le is the highest inductance of any 18 Sound 10-inch driver in the range — the ferrite motor without SDR or AIC compensation produces significant impedance rise at higher frequencies. This is the trade-off for the 75 mm coil’s raw force output without the additional ring or AIC hardware that reduces inductance on other models.
At 7.2 kg, 260 mm overall diameter, 232 mm baffle cutout, and 127 mm depth, the 18 Sound 10MB777 is the heaviest 10-inch driver in 18 Sound’s catalogue — 1 kg heavier than the ferrite 10M600 and more than double the weight of the lightweight neodymium options.
Performance and Applications for the 18 Sound 10MB777
The 18 Sound 10MB777 delivers 98 dB sensitivity across a 55 Hz – 4500 Hz bandwidth. The 450 W AES / 700 W continuous program power handling is the highest of any ferrite 10-inch mid-bass in the range, and competitive even against several neodymium options.
18 Sound recommends a 25-litre vented enclosure tuned to 65 Hz, but the driver’s primary design intent is extremely compact two-way reflex enclosures between 10 and 40 litres — a wide window that gives builders flexibility depending on whether tight bass response or extended low-frequency output is the priority.
The 6.5 mm Xmax provides solid mid-bass displacement — more than the AIC and SDR-equipped mid-bass options in the neodymium range, though without their inductance advantages. The 1.6 mH Le means passive crossover designs need to account for significant impedance rise through the upper operating range; active DSP-based systems handle this more gracefully.
The comparison to the 10M600 midrange this driver was developed from is instructive: the 10M600 delivers 102 dB from 80 Hz – 5200 Hz at 7.35 kg with a 4 mm Xmax, optimised purely for midrange output. The 18 Sound 10MB777 trades 4 dB of sensitivity and some bandwidth for 6.5 mm of Xmax and mid-bass versatility — a genuine mid-bass driver rather than a midrange specialist.
The limited U.S. distribution through Thunderball Marketing positions this as a specialised, market-specific product, likely developed for particular OEM or regional applications where the combination of high ferrite power handling and 10M600-derived motor linearity matters.
Conclusion – 18 Sound 10MB777 Mid-Bass Driver
The 18 Sound 10MB777 brings 18 Sound’s flagship 75 mm ISV coil technology to a ferrite-motored 10-inch mid-bass platform developed directly from the 10M600 midrange. The 98 dB sensitivity, 450 W AES power handling, and 6.5 mm Xmax combine motor linearity with genuine mid-bass displacement capability that few ferrite 10-inch drivers in 18 Sound’s range can match.
The 7.2 kg weight and 1.6 mH inductance are the honest costs — the heaviest 10-inch and the highest inductance in the catalogue. For compact two-way reflex systems where ferrite pricing and 10M600-class motor engineering matter more than minimum weight or crossover simplicity, the 18 Sound 10MB777 delivers a proven, high-power mid-bass platform for the U.S. market.
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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.
