18 Sound 8MB710 – LF Driver

18 Sound 8MB710 – Lightweight Variant 8-Inch Ferrite Mid-Bass with 99.5 dB Sensitivity and 0.11 mH Inductance

The 18 Sound 8MB710 is a lightweight variant of 18 Sound’s highest-sensitivity 8-inch ferrite mid-bass platform. It delivers the same 99.5 dB sensitivity, the same 0.11 mH inductance, the same 13.4 Tm force factor, and the same 18 g moving mass as the 8MB720 — every acoustic, electrical, and T/S specification is shared between the two models. The difference is weight: the 18 Sound 8MB710 weighs 4.2 kg, 400 g lighter than the 8MB720’s 4.6 kg, from a modified chassis construction that reduces the structural mass without affecting the motor, coil, cone, or acoustic performance.

The 99.5 dB sensitivity remains the highest of any 18 Sound 8-inch mid-bass or woofer — surpassing every neodymium alternative in the range. The 0.11 mH inductance remains the second-lowest of any 18 Sound LF driver. The 13.4 Tm force factor from the ferrite motor and the 18 g moving mass produce the same 0.744 Tm/g Bl/Mms ratio — the highest motor authority per gram of cone mass of any 18 Sound 8-inch mid-bass.

For builders who want the 8MB720’s performance at 400 g less weight, the 18 Sound 8MB710 delivers the identical acoustic result from a lighter package. Same sensitivity, same inductance, same motor force, same enclosure — less weight on the baffle.

At 4.2 kg with a 51 mm ISV coil, ferrite motor, weather-protected cone, 225 mm overall diameter, 186 mm baffle cutout, 105 mm depth, and a 10-litre recommended enclosure tuned to 120 Hz, the 18 Sound 8MB710 is the lighter path to the same 99.5 dB ferrite mid-bass performance. Limited distribution U.S. only through Universal Music. 18 Sound lists the 8NMB750 as the alternative/current model.

Design and Construction of the 18 Sound 8MB710

The 18 Sound 8MB710 uses the same 51 mm (2-inch) ISV (Interleaved Sandwich Voice Coil) as the 8MB720. The ISV places conductor on both inner and outer surfaces of the former, creating the mass-balanced coil that produces the 0.11 mH inductance without SDR or copper ring — the same near-record figure achieved purely through the ISV coil’s symmetrical winding and ferrite motor geometry.

The 13.4 Tm force factor from the ferrite magnetic circuit is identical. The same magnetic structure concentrates the same flux in the same gap, producing the same motor force. The 18 g moving mass is unchanged — the same curvilinear cone, the same triple roll surround, the same 2.25 mm Xmax with 3.0 mm Xvar. Every component in the acoustic path is shared between the 18 Sound 8MB710 and the 8MB720.

The 400 g weight difference — 4.2 versus 4.6 kg — originates in the chassis construction. The identical motor, coil, cone, and magnet assembly mean the acoustic and electrical performance is the same. The weight reduction comes from the non-acoustic structural elements — the basket or frame that holds the motor and supports the cone assembly. A lighter chassis construction using different material gauge, geometry, or alloy composition accounts for the 400 g saving.

The weather-protected cone treatment and coated plates match the 8MB720. The 225 mm overall diameter, 210 mm bolt circle, 186 mm baffle cutout, 105 mm depth, and 11 mm flange are all identical. The 18 Sound 8MB710 drops into the same baffle opening as the 8MB720 with no modification.

Performance and Applications for the 18 Sound 8MB710

The 18 Sound 8MB710 delivers 99.5 dB sensitivity across a 150 Hz – 3500 Hz bandwidth — identical to the 8MB720 in every measured output parameter. The 250 W AES / 500 W program power handling, the 108 Hz Fs, the 0.32 Qts, the 308 Hz EBP, and the 3.1% reference efficiency all match exactly. The two drivers produce the same sound at the same power in the same enclosure.

The 10-litre vented enclosure tuned to 120 Hz is the same recommendation. The T/S parameters that govern enclosure behaviour are identical — same Qts, same Vas, same Fs. Any enclosure designed for the 8MB720 works identically with the 18 Sound 8MB710.

The 400 g weight advantage is the 18 Sound 8MB710’s sole differentiator. For applications where per-driver weight compounds across multiple cabinets — touring rigs with multiple three-way cabinets, multi-cabinet installations, or systems where shipping weight affects logistics — the 400 g per driver adds up. In a system using 16 mid-bass drivers, the 18 Sound 8MB710 saves 6.4 kg of total driver weight versus the 8MB720.

The 0.11 mH inductance, 13.4 Tm Bl, 99.5 dB sensitivity, and 18 g Mms — every specification that makes the platform exceptional — carry over unchanged. The 18 Sound 8MB710 is not a different driver. It’s the same driver in a lighter frame.

The same limited U.S. distribution through Universal Music applies. The same 8NMB750 alternative/current model listing indicates both the 18 Sound 8MB710 and 8MB720 share the same legacy trajectory.

Conclusion – 18 Sound 8MB710 Mid-Bass Driver

The 18 Sound 8MB710 is the 8MB720 at 4.2 kg instead of 4.6 kg. Every acoustic specification, every electrical parameter, every T/S value, and every physical dimension is shared between the two models. The 400 g weight reduction comes from the chassis construction — lighter structural elements supporting the same motor, coil, cone, and magnet assembly.

For builders choosing between the two, the decision is purely weight versus chassis robustness. The 18 Sound 8MB710’s lighter frame saves 400 g per driver. The 8MB720’s heavier frame provides more structural mass. Both deliver 99.5 dB sensitivity, 0.11 mH inductance, 13.4 Tm force factor, and the highest mid-band output per watt of any 18 Sound 8-inch — the same ferrite mid-bass that outperforms neodymium on sensitivity, from a lighter package.