Eighteen Sound 12NMB420-8

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Eighteen Sound 12NMB420-8 — 12" Neodymium Midbass Woofer

The Eighteen Sound 12NMB420-8 is a professional 12" midbass woofer developed for compact two-way systems and stage monitors. It combines very high sensitivity, low weight thanks to the neodymium magnet and stable power handling. The design with 65 mm voice coil, SDR technology 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: 100.5 dB (1 W / 1 m)
  • Rated power: 300 W AES, 450 W program
  • Frequency range: 55–6000 Hz
  • Voice coil: 65 mm copper, ISV technology
  • Magnet: Neodymium
  • Weight: ~4.8 kg

Thiele/Small parameters

Fs: 53 Hz
Qty: 0.28
Qes: 0.30
Qms: 3.6
Vase: 65 L
Sd: 531 cm²
Weight: 33.5 g
BL: 13.9 T m
Xmax: ±4 mm
Efficiency: 3.2 %

Recommended use

  • Compact two-way systems with bass reflex cabinet (35–55 L, tuned to approx. 55–65 Hz)
  • Midbass applications in PA systems
  • Stage monitors with high SPL requirements
  • Crossover guidelines: HP 55–65 Hz, LP up to 3–4 kHz

Item no.

  • Manufacturer: Eighteen Sound
  • Model: 12NMB420-8
  • Category: Cone driver / Midbass Woofer