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18SOUND 12NCX750H

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18SOUND (Eighteen Sound) 12NCX750H — 12" / 12 inch Coaxial Driver · Coax / Coaxial Driver · Neodymium
3"/2.4" voice coils · 8 Ω
Part no.: 42A-CHS-KO-18S-0009

635.00 € 635.0 EUR 635.00 €

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18SOUND 12NCX750H — 12" · Coaxial Driver

400 W AES · 95.3 dB Sensitivity · Frequency range 60 Hz – 4000 Hz

Technical data

  • Diameter: 12 "
  • Voice coil: 3 "
  • Power handling: 400 W AES
  • Sensitivity: 95.3 dB
  • Impedance: 8 Ω
  • Magnet: Neodymium
  • Weight: 4.7 kg
  • Mounting depth: 148 mm
  • Frequency range: 60 – 4000 Hz
  • Cone material: Titanium
  • Coverage angle: 70x50 °
  • Rec. crossover: 1.2 kHz

Datasheet (PDF) · Manufacturer page

Series: NCX · Part no.: 42A-CHS-KO-18S-0009

18Sound 12NCX750H: 12" coax with 70°x50° horn, 400 W AES and 95.3 dB

On the 18Sound 12NCX750H the horn is the deciding factor: instead of the conical dispersion of its sister model, this 12" coaxial driver carries an asymmetric horn with 70°x50°, which spreads the HF wider horizontally and keeps it tighter vertically. That is the format for cabinets whose coverage must be tailored to an audience area or a stage. The technical basis stays the same: 12" woofer with 3" voice coil, compression driver with 2.4" voice coil and titanium diaphragm, neodymium motor, 8 Ω, 400 W AES.

At 95.3 dB sensitivity, 4.7 kg and 148 mm mounting depth the driver remains manageable. The Thiele-Small parameters are those of the NCX750 family in 12": Fs 58 Hz, Qms 6.42, Qes 0.31, Qts 0.29, Vas 63 l, BL 17.5 Tm, Mms 47 g, Xmax 5.5 mm, Sd 531 cm². Qes well below Qms means the damping comes from the motor, not from the suspension – exactly as it should be on a driver made for bass reflex and high levels.

Use and enclosure

The 70°x50° horn is made for upright two-way tops where the wide axis lies horizontally and the narrower vertical wastes less energy on ceiling and floor. Mounted a quarter turn round it becomes a monitor wedge that covers the stage widely. Because the HF driver sits coaxially, the transition between the two ways remains a point source in every mounting orientation.

You take the enclosure design from the 12NCX750: bass reflex with around 27 l net, tuned to 74 Hz, f3 near 85 Hz as a guide value; the EBP of 187 argues clearly against a sealed box for the low end, and a sealed 13 l at fc 141 Hz only makes sense as a mid-high compartment above a subwoofer. Fine-tune with the enclosure calculator at 42.audio. The crossover between woofer and horn is 1.2 kHz by manufacturer recommendation, which matches the beaming of the 12" cone; a DSP with delay alignment makes the transition particularly straightforward on coaxes.

What to look out for

  • Asymmetric horn 70°x50°: choose the mounting orientation by application (top or wedge)
  • 400 W AES at 8 Ω, 95.3 dB sensitivity
  • Neodymium, 4.7 kg, 148 mm mounting depth
  • Fs 58 Hz, Qts 0.29, Vas 63 l – bass reflex guide 27 l at 74 Hz
  • Crossover 1.2 kHz, Xmax 5.5 mm

Frequently asked questions

When is the 12NCX750H the right choice over the 12NCX750?

When the cabinet needs a defined, uneven coverage – say a top that should radiate wide horizontally but narrow vertically. For all-round coverage or in ceiling speakers the conical horn of the 12NCX750 is the simpler solution. Woofer section and enclosure are identical on both.

Which power amp suits the 12NCX750H?

At 8 Ω and 400 W AES, an amplifier in that class per channel. Run actively, the HF section needs less power; what matters is a clean high-pass at 1.2 kHz with a steep slope and a limiter, because clipping endangers the driver more than power does.

Are there alternatives with similar parameters?

In the driver database at 42.audio you will find the B&C 12FHX76 with fs 48 Hz, Qts 0.33 and Vas 88 l, and in the shop the Beyma 12CXA400Nd with fs 45 Hz, Qts 0.25 and Vas 88.5 l. Both need considerably larger enclosures than the 12NCX750H.

18Sound 12NCX750H: 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 12NCX750H 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 12NCX750H 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 fs58 Hz
Total Q Qts0.29
Electrical Q Qes0.31
Mechanical Q Qms6.42
Equivalent volume Vas63.0 l
Moving mass Mms47.0 g
Cone area Sd531 cm²
Linear excursion Xmax5.5 mm
Force factor BL17.5 Tm
DC resistance Re5.4 Ω
Voice coil inductance Le0.62 mH

Enclosure suggestion

The EBP of 187 suggests a bass-reflex enclosure. EBP = fs / Qes = 58 / 0.31

Sealed (Qtc 0.707)

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

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
21.2 l
Tuning frequency Fb
81 Hz
Cut-off frequency F3
94 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) 400
Sensitivity (dB) 95.3
Frequency from (Hz) 60
Frequency to (Hz) 4000
Abmessungen & Korb
Diameter 12
Voice coil (inch) 3
Mounting depth (mm) 148
Weight (kg) 4.7
Thiele-Small-Parameter
Re (Ω) 5.4
Le (mH) 0.62
Fs (Hz) 58
Qms 6.42
Qes 0.31
Qts 0.29
Vas (l) 63
Xmax (mm) 5.5
BL (Tm) 17.5
Mms (kg) 0.047
Sd (m²) 0.0531