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18SOUND 12NCX910

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18SOUND (Eighteen Sound) 12NCX910 — 12" / 12 inch Coaxial Driver · Coax / Coaxial Driver · Neodymium
3"/3" voice coils · 8 Ω
Part no.: 42A-CHS-KO-18S-0006

600.00 € 600.0 EUR 600.00 €

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  • Impedance (Ω)
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  • Frequency to (Hz)
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  • Fs (Hz)
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18SOUND 12NCX910 — 12" · Coaxial Driver

450 W AES · 99.5 dB Sensitivity · Frequency range 60 Hz – 4000 Hz

Technical data

  • Diameter: 12 "
  • Voice coil: 3 "
  • Power handling: 450 W AES
  • Sensitivity: 99.5 dB
  • Impedance: 8 Ω
  • Magnet: Neodymium
  • Weight: 6 kg
  • Mounting depth: 210 mm
  • Frequency range: 60 – 4000 Hz
  • Cone material: Titanium
  • Coverage angle: 80 °
  • Rec. crossover: 1.5 kHz

Datasheet (PDF) · Manufacturer page

Series: NCX · Part no.: 42A-CHS-KO-18S-0006

18Sound 12NCX910: 12" coax with 3"/3" voice coils, 99.5 dB and 450 W AES

99.5 dB sensitivity from a coaxial driver – the 18Sound 12NCX910 is the NCX-series model for applications where level and headroom come before compactness. Both ways use 3" voice coils: the 12" woofer as well as the compression driver with titanium diaphragm, which radiates through a conical 80° horn in the centre. A 3" HF coil means more diaphragm area and thermal capacity than the 2.4" drivers of the 750 models. A neodymium magnet drives it all; the unit weighs 6 kg at 210 mm mounting depth.

Power handling 450 W AES, 8 Ω, Fs 57 Hz, Qms 10, Qes 0.31, Qts 0.3, Vas 58 l, BL 18.1 Tm, Mms 53 g, Le 0.78 mH and an Xmax of 6.9 mm – that is the woofer side. The higher Xmax compared with the 750s gives the 12NCX910 noticeably more excursion headroom at low tuning, and the high Qms indicates a mechanically low-loss suspension. The recommended crossover is 1.5 kHz.

Use and enclosure

Where the 12NCX910 belongs: powerful stage monitors, full-range tops for medium-sized reinforcement, compact two-way systems in clubs and installations that are to get by with a single driver per cabinet. The point-source nature of the coaxial layout ensures that the transition at 1.5 kHz sounds the same at every angle – particularly in a monitor, where the listener rarely stands on axis, that is the real advantage.

Enclosure: the EBP of 184 points to bass reflex. As a guide from the Thiele-Small parameters you get around 27 l net tuned to 71 Hz with an f3 near 80 Hz. Sealed, about 13 l at fc 134 Hz is a reference, practically sensible only as a mid-high compartment above a subwoofer. Keep the 210 mm mounting depth in mind when planning the cabinet – the HF driver sits behind the magnet, and there must be air behind it. The enclosure calculator at 42.audio helps weigh volume against tuning. The 1.5 kHz crossover is cleanest done actively with DSP and delay alignment; passively, a measurement in the finished cabinet is mandatory.

What to look out for

  • 3" voice coils in both ways, 450 W AES at 8 Ω
  • 99.5 dB sensitivity – high level from moderate amplifier power
  • 210 mm mounting depth and 6 kg: plan cabinet depth and fixing
  • Xmax 6.9 mm, Fs 57 Hz, Qts 0.3: bass reflex guide 27 l at 71 Hz
  • Recommended crossover 1.5 kHz, conical 80° horn

Frequently asked questions

How does the 12NCX910 differ from the 12NCX750?

The 12NCX910 has a 3" voice coil in the HF section instead of 2.4", 450 W AES, 99.5 dB sensitivity and 6.9 mm Xmax. In return it is considerably deeper at 210 mm and heavier at 6 kg. The 12NCX750 with fs 58 Hz, Qts 0.29 and Vas 63 l is the more compact choice when depth and weight count.

What is the 12NCX910N?

The N is the variant with an NSD dome in the HF driver instead of the titanium diaphragm; the Thiele-Small parameters at fs 57 Hz, Qts 0.3 and Vas 58 l are identical. Enclosure and crossover therefore stay the same, and the decision comes down to the character of the HF section.

Which power amp is recommended?

At 8 Ω and 450 W AES an amplifier in that class is appropriate, though 99.5 dB sensitivity means less power already delivers high levels. Crossed actively at 1.5 kHz the HF section needs only a fraction of it; a limiter protects both ways.

18Sound 12NCX910: manufacturer, spellings and classification

18Sound, 18 Sound and Eighteensound all refer to the same manufacturer: Eighteen Sound S.r.l. of Reggio Emilia, Italy. The 12NCX910 is a 12-inch coaxial driver with neodymium magnet from the NCX series, available from 42.audio, 18Sound dealer in Germany, with datasheet and full specifications in the driver database.

At 42.audio you get the 18SOUND 12NCX910 with datasheet PDF, all key data in the driver database and the enclosure calculator. More drivers from this manufacturer: Atlas 18Sound.

Thiele-Small parameters

Nominal impedance8 Ω
Resonance frequency fs57 Hz
Total Q Qts0.3
Electrical Q Qes0.31
Mechanical Q Qms10
Equivalent volume Vas58.0 l
Moving mass Mms53.0 g
Cone area Sd531 cm²
Linear excursion Xmax6.9 mm
Force factor BL18.1 Tm
DC resistance Re5.3 Ω
Voice coil inductance Le0.78 mH

Enclosure suggestion

The EBP of 184 suggests a bass-reflex enclosure. EBP = fs / Qes = 57 / 0.31

Sealed (Qtc 0.707)

Enclosure volume Vb
12.7 l
System resonance Fc
134 Hz
Cut-off frequency F3
134 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
21.8 l
Tuning frequency Fb
77 Hz
Cut-off frequency F3
88 Hz

Vb is the required net internal volume, Fb the tuning frequency of the reflex port and F3 the frequency at which the level has dropped by 3 dB. Calculated approximation after Small. A starting point for simulation, not a finished build plan.

Comparable drivers

Same size, same type, Qts within ±30 %.

Specifications

Allgemein
Manufacturer 18SOUND
Category Coaxial
Series NCX
Magnet Neodymium
Impedance (Ω) 8
Power handling (W) 450
Sensitivity (dB) 99.5
Frequency from (Hz) 60
Frequency to (Hz) 4000
Abmessungen & Korb
Diameter 12
Voice coil (inch) 3
Mounting depth (mm) 210
Weight (kg) 6
Thiele-Small-Parameter
Re (Ω) 5.3
Le (mH) 0.78
Fs (Hz) 57
Qms 10
Qes 0.31
Qts 0.3
Vas (l) 58
Xmax (mm) 6.9
BL (Tm) 18.1
Mms (kg) 0.053
Sd (m²) 0.0531