Eighteen Sound 12NMB420

Eighteen Sound 12NMB420
General Specifications Datasheet
Brand Eighteen Sound
Reference 12NMB420
Size 12 in
300 mm
Type Low frequency
Impedance Z 8 Ω
Minimum impedance Zmin 6.9 Ω
Nominal Power P 300 W
Program Power Pmax 450 W
Sensitivity SPL 100.5 dB
Usable frequency range 55 - 6000 Hz
Recommended crossover 2000 Hz
  • 100,5 dB SPL 1W / 1m average sensitivity
  • 65 mm (2,5 in) Interleaved Sandwich Voice coil (ISV)
  • 300 W AES power handling
  • Single Demodulating Ring (SDR) for lower distortion
  • Copper ring for lower intermodulation distortion
  • External neodymium magnet assembly
  • Weather protected cone and plates for outdoor usage
  • Specially designed for compact two way systems
Eighteen Sound 12NMB420 Frequency response
Eighteen Sound 12NMB420 Impedance
Thiele/Small parameters Values in gray are calculated.
Resonant frequency Fs 53 Hz
Surface area of cone Sd 530 cm²
DC resistance Re 5.2 Ω
Mechanical Q Qms 3.60
Electromagnetic Q Qes 0.30
Total Q factor Qts 0.28
Mechanical suspension compliance Cms 264 µm/N
Compliance equivalent air volume Vas 105 liters
Moving mass Mmd 26.5 g
Moving mass (including airload) Mms 33.5 g
Mechanical resistance Rms 3.1 N·s/m
BL product BL 13.9 T·m
Voice coil inductance Le 0.2 mH
Maximum linear excursion (one way) Xmax 4 mm
Maximum mechanical limit (one way) Xlim 11 mm
Efficiency η₀ 5.01 %
Efficiency bandwidth product EBP 176
Effective diaphragm diameter Ø 26 cm
Import this driver in a simulation software:
WinISD 18Sound 12NMB420.wdr
Hornresp 18Sound 12NMB420.txt
Basta! 18Sound 12NMB420.bastaelement
Eighteen Sound 12NMB420 Dimensions
Dimensions
Overall diameter 315 mm
Baffle hole diameter 282 mm
Overall depth 127 mm
Flange thickness 11.5 mm
Net weight 2.8 kg
Materials of construction
Diaphragm material Paper
Diaphragm shape Curvilinear
Surround material Polycotton
Voice Coil Parameters
Voice coil diameter 65 mm
Coil material Aluminum
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This page may contain errors or inaccuracies. Please check the up-to-date specifications on the manufacturer website before starting your project.

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