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18SOUND 15NLW9401

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18SOUND (Eighteen Sound) 15NLW9401 — 15" / 15 inch · Woofer · Subwoofer / Bass · Neodymium
4" voice coil · 8 Ω
Part no.: 42A-CHS-TT-18S-0049

399.00 € 399.0 EUR 399.00 €

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  • Impedance (Ω)
  • Power handling (W)
  • Sensitivity (dB)
  • Frequency from (Hz)
  • Frequency to (Hz)
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  • Re (Ω)
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  • Xmax (mm)
  • BL (Tm)
  • Mms (kg)
  • Sd (m²)

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18SOUND 15NLW9401 — 15" · Woofer

1200 W AES · 97.5 dB Sensitivity · Frequency range 37 Hz – 2300 Hz

Technical data

  • Diameter: 15 "
  • Voice coil: 4 "
  • Power handling: 1200 W AES
  • Sensitivity: 97.5 dB
  • Impedance: 8 Ω
  • Magnet: Neo
  • Weight: 7.5 kg
  • Mounting depth: 180 mm
  • Frequency range: 37 – 2300 Hz

Datasheet (PDF) · Manufacturer page

Series: NLW · Part no.: 42A-CHS-TT-18S-0049

18Sound 15NLW9401: 15" neodymium subwoofer with 1200 W and 10 mm Xmax

If you are after a 15" bass driver with plenty of excursion and high power handling at low weight, 18Sound's 15NLW9401 is an obvious stop. This NLW series driver pairs a neodymium motor with a 4" voice coil, handles 1200 W AES and weighs 7.5 kg. Its 97.5 dB sensitivity is high for a driver with 10 mm linear excursion and 140 g of moving mass.

The Thiele-Small data show the intent: Fs 39 Hz, Qts 0.26, Qes 0.28 and a Vas of 134 l that is moderate for a 15". The motor with BL 25.4 Tm is among the strongest in this class; the 1.9 mH inductance is the price of the long 4" coil. The stated range runs from 37 Hz to 2300 Hz, so this driver is meant for subwoofer and bass duty, not midrange.

Use and enclosure

A vented box is the natural choice: EBP 139 and Qts 0.26 leave little room for sealed designs. The guide value from the TSP is around 42 l net, tuned to 55 Hz with an f3 near 67 Hz – a very compact volume for a 15", thanks to the small Vas. For deeper extension you go larger in volume and lower in tuning and pay with efficiency; such variants are easy to try in the enclosure calculator at 42.audio. The strong motor is also a good starting point for bandpass or horn designs.

With 10 mm Xmax and 1200 W the 15NLW9401 takes serious amplifier power into 8 Ω. Cross low as a subwoofer; as the bass in a 2-way system stay well below the 2300 Hz upper limit. The 180 mm mounting depth is moderate for a 4" neodymium woofer.

What to look out for

  • 1200 W AES power handling and 10 mm Xmax: built for high continuous power.
  • 8 Ω, Re 5.2 Ω: work with the real impedance when paralleling several drivers.
  • 7.5 kg thanks to the neodymium magnet, mounting depth 180 mm.
  • Le 1.9 mH: upper limit 2300 Hz, not a midrange driver.
  • Vas 134 l and Qts 0.26: small vented volume around 42 l as a guide value.

Frequently asked questions

15NLW9401 or 15NLW9300 – which one is right?

The 15NLW9401 has more power handling (1200 W), more excursion (10 mm) and a stronger motor with BL 25.4 Tm. The 15NLW9300 is somewhat weaker at 800 W and 8 mm Xmax but lighter on the cone and rated for a wider range at the top. For subwoofers with high output demands take the 9401.

How low does the 15NLW9401 go in a vented box?

The guide value is an f3 around 67 Hz in 42 l tuned to 55 Hz. That is a compact, high-output alignment; for deeper bass you increase the volume and tune lower, which the enclosure calculator lets you follow step by step.

Which power amplifier fits?

A channel delivering around 1200 W into 8 Ω makes full use of the driver. A high-pass below the tuning frequency protects the 4" voice coil from over-excursion.

At 42.audio you get the 18SOUND 15NLW9401 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 fs39 Hz
Total Q Qts0.26
Electrical Q Qes0.28
Mechanical Q Qms4.13
Equivalent volume Vas134.0 l
Moving mass Mms140.0 g
Cone area Sd850 cm²
Linear excursion Xmax10 mm
Force factor BL25.4 Tm
DC resistance Re5.2 Ω
Voice coil inductance Le1.9 mH

Enclosure suggestion

The EBP of 139 suggests a bass-reflex enclosure. EBP = fs / Qes = 39 / 0.28

Sealed (Qtc 0.707)

Enclosure volume Vb
21.0 l
System resonance Fc
106 Hz
Cut-off frequency F3
106 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
31.4 l
Tuning frequency Fb
61 Hz
Cut-off frequency F3
74 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) 97.5
Frequency from (Hz) 37
Frequency to (Hz) 2300
Abmessungen & Korb
Diameter 15
Voice coil (inch) 4
Mounting depth (mm) 180
Weight (kg) 7.5
Thiele-Small-Parameter
Re (Ω) 5.2
Le (mH) 1.9
Fs (Hz) 39
Qms 4.13
Qes 0.28
Qts 0.26
Vas (l) 134
Xmax (mm) 10
BL (Tm) 25.4
Mms (kg) 0.14
Sd (m²) 0.085