18 Sound 8MB720-8 8" Midbass Woofer — Octagon Shape, 250 W / 500 W, 8 Ω, Weather-Protected, 2" ISV Voice Coil

The 18 Sound 8MB720-8 is an advanced 8-inch ceramic mid-bass driver engineered for compact, high-performance three-way loudspeaker systems. It delivers a linear response with very low distortion and reduced power compression while offering high power capability — 250 W nominal with 500 W program handling. The driver features a 51 mm (2.0 in) Interleaved Sandwich Voice coil (ISV), a weather-treated cone and coated plates for enhanced durability in demanding environments, and an octagon-shaped frame for compact installations. Key features - 99.5 dB SPL (1W/1m) average sensitivity - 500 W program power handling (250 W nominal) - 51 mm (2.0 in) Interleaved Sandwich Voice coil (ISV) - Weather-protected cone and coated plates - Designed for high-performance compact three-way systems Design details - Surround shape: Triple roll - Magnet material: Ferrite - Recommended enclosure volume: 10.0 dm3 (0.35 ft3) - Recommended tuning: 120 Hz Electrical and acoustic specifications - Nominal impedance: 8 Ω - Minimum impedance: 6.3 Ω - Nominal power handling: 250 W - Continuous power handling: 500 W - Sensitivity: 99.5 dB - Frequency range: 150 - 3500 Hz - Voice coil diameter: 51 mm (2.0 in) Thiele-Small and mechanical parameters - Resonance frequency (Fs): 108 Hz - Re: 5.2 Ω - Qes: 0.35 - Qms: 4.6 - Qts: 0.32 - Vas: 9.0 dm3 (0.32 ft3) - Sd: 227.0 cm2 (35.19 in2) - : 3.1 % - Xmax: 2.25 mm - Xvar: 3.0 mm - Mms: 18.0 g - Bl: 13.4 Txm - Le: 0.11 mH - EBP: 308 Hz Mounting and shipping - Overall diameter: 225 mm (8.86 in) - Bolt circle diameter: 210 mm (8.27 in) - Baffle cutout diameter: 186.0 mm (7.32 in) - Depth: 105 mm (4.13 in) - Flange and gasket thickness: 11 mm (0.43 in) - Net weight: 4.6 kg (10.14 lb) - Shipping weight: 4.2 kg (9.26 lb) - Shipping box dimensions: 235 x 235 x 150 mm (9.25 x 9.25 x 5.91 in) The 8MB720-8 combines rugged, weather-resistant construction with ISV voice-coil technology and high sensitivity, making it an excellent choice for compact, high-output three-way systems where reliability and clarity are required.