Eighteen Sound 12MB650-8 — 12" Ferrite Midbass Woofer
The Eighteen Sound 12MB650-8 is a professional 12" midbass woofer developed for compact two-way systems and bass reflex cabinets. It combines high sensitivity, stable power handling and controlled frequency response. The design with 75 mm voice coil, ferrite magnet and weather-protected cone provides reliable operation even under continuous load. The element is optimized for midbass applications where both SPL and linearity are crucial.
Technical data
- Size: 12" (310 mm outer diameter, 288 mm recessed diameter, 135 mm depth)
- Impedance: 8 ohms
- Sensitivity: 97 dB (1 W / 1 m)
- Rated power: 400 W AES, 800 W program
- Frequency range: 55–4000 Hz
- Voice coil: 75 mm copper, ISV technology
- Magnet: Ferrite
- Weight: ~7.8 kg
Thiele/Small parameters
Fs: 55 Hz
Qts: 0.29
Qes: 0.31
Qms: 6.0
Vase: 58 L
Sd: 530 cm²
Weight: 68 g
BL: 18.5 T m
Xmax: ±6 mm
Efficiency: 3.3 %
Recommended use
- Compact two-way systems with bass reflex cabinet (40–60 L, tuned to approx. 55–65 Hz)
- Midbass applications in PA systems
- Crossover guidelines: HP 55–65 Hz, LP up to 2.5–3.5 kHz
- Installations where ferrite construction and high SPL are preferred
Item no.
- Manufacturer: Eighteen Sound
- Model: 12MB650-8
- Category: Cone driver / Midbass Woofer
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