Eighteen Sound 8M400F-8

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Eighteen Sound 8M400F-8 — 8" Woofer

The Eighteen Sound 8M400F-8 is a professional 8" ferrite woofer with 8 ohm impedance. It is designed for midrange and compact bass reproduction in PA systems, line array modules and monitors. With a 51 mm voice coil and robust ferrite magnet, it offers high sensitivity, stable performance and long life even under continuous load.

Technical data

  • Size: 8" (outer diameter approx. 210 mm, recess diameter ≈187 mm, depth ≈95 mm)
  • Impedance: 8 ohms
  • Sensitivity: ≈96 dB (1 W / 1 m)
  • Rated power: 200 W AES
  • Program power: 400 W
  • Frequency range: 70–6000 Hz
  • Voice coil: 51 mm (2") copper
  • Magnet: Ferrite
  • Weight: ≈4.5 kg

Thiele/Small parameters

Fs: 70 Hz
Qty: 0.32
Qes: 0.34
Qms: 6.5
Re: 5.3 Ω
Weight: ≈28 g
Sd: ≈220 cm²
Xmax: ±4 mm
Baffle cutout: ≈187 mm
Bolt circle diameter: ≈200 mm
Total depth: ≈95 mm

Recommended use

  • Midrange in professional PA systems
  • Cabinet: Small bass reflex or closed boxes, 10–20 dm³
  • Crossover guidelines: HP 70–80 Hz, LP up to 4–6 kHz
  • Designed for robust long-term performance and stable construction

Item no.

  • Manufacturer: Eighteen Sound
  • Model: 8M400F-8
  • Category: Woofer / LF driver