Eighteen Sound 15NCX750H-8+8

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Eighteen Sound 15NCX750H-8+8 — 15" Neodymium Coaxial

The Eighteen Sound 15NCX750H-8+8 is a powerful 15" coaxial speaker with dual 8 ohm loads (LF + HF). It combines a high-performance neodymium woofer with a 2.5" compression driver mounted coaxially for true point source. The design provides high SPL, low distortion and flexible amplifier matching. Ideal for professional PA systems, monitors and compact speaker solutions.

Technical data

  • Size: 15" (outer diameter approx. 386 mm, recess diameter 355 mm, depth ≈200 mm)
  • Impedance: LF 8 Ω + HF 8 Ω
  • Sensitivity: LF ≈98 dB, HF ≈107 dB (1 W / 1 m)
  • Rated power: LF 500 W AES, HF 80 W AES
  • Frequency range: 45–18,000 Hz
  • Voice coil LF: 75 mm (3")
  • Voice coil HF: 65 mm (2.5")
  • Magnet: Neodymium
  • Weight: ≈8.0 kg

Thiele/Small parameters (LF)

Fs: 45 Hz
Qty: 0.32
Qes: 0.34
Qms: 7.0
Re: 5.3 Ω
Weight: 110 g
Baffle cutout: 355 mm
Bolt circle diameter: 370 mm
Total depth: ≈200 mm

Recommended use

  • Coaxial solution for monitors and compact PA systems
  • Cabinet: Bass reflex or horn, 50–120 dm³
  • Crossover guidelines: LF HP 45–60 Hz, HF LP up to 18 kHz
  • Flexible bi‑amp or passive operation thanks to separate 8 Ω loads

Item no.

  • Manufacturer: Eighteen Sound
  • Model: 15NCX750H-8+8
  • Category: Coaxial driver