Eighteen Sound 12NCX750

Coaxial

Nominal diameter12″ / 300 mm
Resonance58 Hz
Q factor0.29
Sensitivity97.6 dB
Linear excursion± 5.5 mm
Program Power800 W
Ω°0102030405060101001 00010 000-180-120-60060120180Electrical ImpedanceElectrical Phase
mm05101520101001 00010 000Diaphragm ExcursionMaximum Linear Excursion
m/s0246810101001 00010 000Diaphragm Velocity
dB60708090100110120101001 00010 000SPL (1W, 1m, on axis)Maximum SPL
°-180-120-60060120180101001 00010 000Acoustical phase (1m, on axis)
ms051015202530101001 00010 000Group Delay (1m, on axis)
00.51-205101520Step response
-1-0.500.51-2010203040Response to a tone burst of Hz with cycles
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply
  • Sensitivity (1W, 1m, infinite baffle) SPL1W 97.6dB
  • Frequency response 60 - 5000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 58Hz
  • Mechanical quality factor QMS 6.42
  • Electrical quality factor QES 0.31
  • Total quality factor QTS 0.29

Large signal parameters

  • Maximum linear excursion xmax 5.5mm
  • Air volume displaced at xmax VD 292cm³
  • Power handling P 400W
  • Program power Pmax 800W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 5.4Ω
  • Inductance (1kHz) LE 0.62mH
  • VC Diameter 75mm
  • Winding material Copper

Magnet

  • Force factor Bl 17.5N/A
  • Motor constant Bl/√RE 7.53N/√W
  • Material Neodymium

Diaphragm

  • Effective diameter 260mm
  • Effective area SD 531cm²
  • Moving mass MMS 48g
  • Moving mass (without air load) MMD 39.4g
  • Material Water repellent

Suspensions

  • Stiffness KMS 6.37N/mm
  • Compliance CMS 157µm/N
  • Equivalent volume to the compliance VAS 63L
  • Mechanical resistance RMS 2.72N·s/m

Dimensions

  • Nominal diameter 12
  • 300mm
  • Overall diameter 310mm
  • Baffle cutout diameter 280mm
  • Overall depth 148mm
  • Flange thickness 14mm
  • Mounting depth 134mm
  • Volume occupied by the driver (estimated) 2.2L
  • Net weight 4.5kg
Eighteen Sound 12NCX750 Impedance
Eighteen Sound 12NCX750 SPL
Eighteen Sound 12NCX750 Directivity map
Eighteen Sound 12NCX750 Dimensions

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8 Ω
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fS58 Hz
SD531 cm²
60 - 4000 Hz
QTS0.29
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SPL1W97.8 dB
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Oberton 12NCX Coaxial

Oberton 12NCX

8 Ω
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fS58.2 Hz
SD515 cm²
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