Eighteen Sound 21NLW9601-8

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Eighteen Sound 21NLW9601-8 — 21" Woofer

The Eighteen Sound 21NLW9601-8 is a professional 21" neodymium woofer developed for extreme SPL applications in PA systems and subwoofer solutions. With a 100 mm voice coil, advanced cooling and weather-protected cone, it offers high sensitivity, low distortion and long life even under continuous load. Ideal for touring, installations and systems where deep bass and maximum SPL are required.

Technical data

  • Size: 21" (outer diameter approx. 530 mm, recess diameter ≈490 mm, depth ≈250 mm)
  • Impedance: 8 ohms
  • Sensitivity: 96–97 dB (1 W / 1 m)
  • Rated power: 1800 W AES
  • Program power: 3600 W
  • Frequency range: 30–2000 Hz
  • Voice coil: 100 mm (4") ISV - Interleaved Sandwich Voice Coil
  • Magnet: Neodymium
  • Weight: ≈13.0 kg

Thiele/Small parameters

Fs: 30 Hz
Qty: 0.28
Qes: 0.29
Qms: 6.5
Re: 5.3 Ω
Weight: ≈280 g
Sd: ≈1680 cm²
Xmax: ±9.5 mm
Baffle cutout: ≈490 mm
Bolt circle diameter: ≈510 mm
Total depth: ≈250 mm

Recommended use

  • Subwoofer in professional PA systems
  • Cabinet: Bass reflex or horn, 150–250 dm³
  • Crossover guidelines: HP 30–35 Hz, LP up to 1–1.2 kHz
  • Designed for high SPL and robust long-term performance

Item no.

  • Manufacturer: Eighteen Sound
  • Model: 21NLW9601-8
  • Category: Woofer / LF driver