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18SOUND 18NLW9400

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18SOUND (Eighteen Sound) 18NLW9400 — 18" / 18 inch · Woofer · Subwoofer / Bass · Neodymium
4" voice coil · 8 Ω
Part no.: 42A-CHS-TT-18S-0040

419.00 € 419.0 EUR 419.00 €

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  • Frequency to (Hz)
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18SOUND 18NLW9400 — 18" · Woofer

1200 W AES · 98 dB Sensitivity · Frequency range 30 Hz – 2500 Hz

Technical data

  • Diameter: 18 "
  • Voice coil: 4 "
  • Power handling: 1200 W AES
  • Sensitivity: 98 dB
  • Impedance: 8 Ω
  • Magnet: Neo
  • Weight: 8.7 kg
  • Mounting depth: 223 mm
  • Frequency range: 30 – 2500 Hz

Datasheet (PDF) · Manufacturer page

Series: NLW · Part no.: 42A-CHS-TT-18S-0040

18Sound 18NLW9400: 18" neodymium woofer at 8.7 kg with 1,200 W AES and 98 dB

8.7 kg: that is the number that defines the 18Sound 18NLW9400. An 18" driver with a 4" voice coil, 1,200 W AES and 98 dB sensitivity that is lighter than any ferrite model of the same power class in the 18Sound range. The neodymium motor with 26 Tm makes this possible, moving a cone of only 180 g Mms. The stated range from 30 Hz to 2,500 Hz shows a driver that can be not only a sub but also the bass in a full-range box.

The Thiele-Small parameters are almost identical to the ferrite brother 18LW1251: Fs 33 Hz, Qts 0.26, Vas 268 l, Xmax 9.5 mm. So the suspension is compliant, the motor is strong, and the whole thing adds up to a low Qts that calls for a generously sized vented enclosure. From the database the Beyma 18PW1400Fe/S (Qts 0.27) and the Oberton 18XB1600 (Qts 0.28) sit next to it, along with the 18Sound 18W2001 at Qts 0.25. The inductance of 1.9 mH is moderate for a 4" coil and keeps the upper bass open.

Use and enclosure

An EBP of 118 argues for bass reflex. The guideline from the parameters is about 84 l net volume tuned to 47 Hz, with a lower cut-off f3 near 57 Hz. That is not a deep-bass sub but a driver for compact bass and full-range boxes, where the 18NLW9400 runs from the tuning frequency up into the upper bass and hands over to a horn above. If you want real extension, place a sub underneath. Sealed, the guideline would be 42 l at a 90 Hz resonance, which is only good for kick-bass applications. Run the alignment through the enclosure calculator at 42.audio.

In a two-way box with compression driver and horn the crossover sensibly sits well below the 2,500 Hz limit, typically between a few hundred hertz and just above 1 kHz. The 9.5 mm Xmax is sufficient for that role; for sub duty below the tuning frequency a high-pass is compulsory.

What to look out for

  • 8 Ω, Re 5 Ω: amplifier channels around 1,200 W into 8 Ω fit, two in parallel at 4 Ω possible.
  • 8.7 kg: the lightest 18" driver of this power class at 42.audio, ideal for portable boxes.
  • Qts 0.26 and EBP 118: vented only, sealed gives no extension.
  • Xmax 9.5 mm: meant for bass and full-range use, for deep bass set a high-pass below the tuning.
  • Mounting depth 223 mm: shallower than most neodymium subs of the NLW series.

Frequently asked questions

What distinguishes the 18NLW9400 from the 18LW1251?

The parameters are nearly the same: Vas 268 l on both, Qts 0.26 versus 0.27, Fs 33 Hz versus 35 Hz. The 18NLW9400 weighs 8.7 kg, the ferrite 18LW1251 considerably more. Power handling is 1,200 W versus 1,000 W. For portable boxes the neodymium model is the obvious choice.

Is the 18NLW9400 suitable as a subwoofer?

For compact bass boxes yes, for deep bass only to a degree. The guideline is 84 l with f3 near 57 Hz, and 9.5 mm Xmax limits excursion. For sub-bass below the tuning frequency a driver with more Xmax from the NLW series is the better choice.

Which amplifier fits?

A channel with around 1,200 W into 8 Ω exhausts the AES rating. At 98 dB the driver reaches high levels with considerably less. A high-pass below the vented tuning and a limiter belong to the setup.

At 42.audio you get the 18SOUND 18NLW9400 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 fs33 Hz
Total Q Qts0.26
Electrical Q Qes0.28
Mechanical Q Qms6.1
Equivalent volume Vas268.0 l
Moving mass Mms180.0 g
Cone area Sd1,225 cm²
Linear excursion Xmax9.5 mm
Force factor BL26 Tm
DC resistance Re5 Ω
Voice coil inductance Le1.9 mH

Enclosure suggestion

The EBP of 118 suggests a bass-reflex enclosure. EBP = fs / Qes = 33 / 0.28

Sealed (Qtc 0.707)

Enclosure volume Vb
41.9 l
System resonance Fc
90 Hz
Cut-off frequency F3
90 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
62.9 l
Tuning frequency Fb
52 Hz
Cut-off frequency F3
62 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 Low Frequency
Series NLW
Magnet Neo
Impedance (Ω) 8
Power handling (W) 1200
Sensitivity (dB) 98
Frequency from (Hz) 30
Frequency to (Hz) 2500
Abmessungen & Korb
Diameter 18
Voice coil (inch) 4
Mounting depth (mm) 223
Weight (kg) 8.7
Thiele-Small-Parameter
Re (Ω) 5
Le (mH) 1.9
Fs (Hz) 33
Qms 6.1
Qes 0.28
Qts 0.26
Vas (l) 268
Xmax (mm) 9.5
BL (Tm) 26
Mms (kg) 0.18
Sd (m²) 0.1225