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18SOUND 15NTLW2500

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18SOUND (Eighteen Sound) 15NTLW2500 — 15" / 15 inch · Woofer/Midrange (WM) · Subwoofer / Bass · Neodymium · Dual-Gap
2x2.5" voice coil · 8 Ω
Part no.: 42A-CHS-TT-18S-0046

335.00 € 335.0 EUR 335.00 €

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18SOUND 15NTLW2500 — 15" · Woofer

600 W AES · 100.5 dB Sensitivity · Frequency range 45 Hz – 3200 Hz

Technical data

  • Diameter: 15 "
  • Voice coil: 2.5 "
  • Power handling: 600 W AES
  • Sensitivity: 100.5 dB
  • Impedance: 8 Ω
  • Magnet: Neo
  • Weight: 3.8 kg
  • Mounting depth: 210 mm
  • Frequency range: 45 – 3200 Hz

Datasheet (PDF) · Manufacturer page

Series: NTLW · Part no.: 42A-CHS-TT-18S-0046

18Sound 15NTLW2500: 15" neodymium woofer with 100.5 dB and dual-gap motor

100.5 dB sensitivity at 3.8 kg – the 15NTLW2500 shows what a neodymium dual-gap motor with two 2.5" voice coils can do on a light 15" cone. 18Sound lists it in the NTLW series as a woofer with midrange capability; the stated range of 45 Hz to 3200 Hz and the low 0.65 mH inductance back that up.

The Thiele-Small parameters fit a high-efficiency bass for tops: Fs 45 Hz, Qts 0.3, Qes 0.31, Vas 143 l, Mms 95 g and BL 21.2 Tm. Power handling is 600 W AES and linear excursion 8 mm. The double-gap design uses two air gaps in the same magnet system, which yields more motor force and more uniform excursion for a given magnet volume.

Use and enclosure

With an EBP of 145 there is no way around a vented box. The guide value is about 68 l net tuned to 56 Hz with an f3 near 63 Hz – a handy volume for a 15" top or a light full-range monitor with a horn. If you use the 15NTLW2500 as a kick bass in a larger system, you stay in the same range. The enclosure calculator at 42.audio provides port dimensions and alternative tunings.

At the top, with a 3200 Hz upper limit, the driver reaches well into the midrange, which relaxes the crossover in a 2-way box with a 1.4" or 2" compression driver. For horn selection 42.audio points to the 18Sound horns & waveguides category. The 210 mm mounting depth is slightly greater than on conventional neodymium woofers of this size because of the dual-gap motor.

What to look out for

  • 100.5 dB sensitivity: very high efficiency for a 15" driver.
  • 3.8 kg thanks to neodymium, mounting depth 210 mm.
  • Dual-gap motor with 2x2.5" voice coil, 600 W AES into 8 Ω (Re 5.1 Ω).
  • Le 0.65 mH: clean up to 3200 Hz.
  • Xmax 8 mm, vented guide value 68 l.

Frequently asked questions

Is the 15NTLW2500 a replacement for the 15LW2400?

Both have Qts 0.3, but the 15LW2400 has Fs 40 Hz and Vas 131 l, the 15NTLW2500 Fs 45 Hz and Vas 143 l. The NTLW is much lighter and more efficient; if you want a bit more extension, look at the 15LW2400 in the shop.

Which compression driver goes with it?

With a 3200 Hz upper limit you can cross to a 1.4" or 2" driver in the lower midrange. The exact throat size and horn depend on the coverage you want; the 18Sound horns in the shop each state the matching driver size.

How much power does the 15NTLW2500 take?

600 W AES into 8 Ω. Thanks to 100.5 dB you need far less amplifier power for high levels than with heavier woofers, which also keeps thermal stress on the 2.5" coils low.

At 42.audio you get the 18SOUND 15NTLW2500 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 fs45 Hz
Total Q Qts0.3
Electrical Q Qes0.31
Mechanical Q Qms8.9
Equivalent volume Vas143.0 l
Moving mass Mms95.0 g
Cone area Sd881 cm²
Linear excursion Xmax8 mm
Force factor BL21.2 Tm
DC resistance Re5.1 Ω
Voice coil inductance Le0.65 mH

Enclosure suggestion

The EBP of 145 suggests a bass-reflex enclosure. EBP = fs / Qes = 45 / 0.31

Sealed (Qtc 0.707)

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

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
53.8 l
Tuning frequency Fb
61 Hz
Cut-off frequency F3
69 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 NTLW
Magnet Neo
Impedance (Ω) 8
Power handling (W) 600
Sensitivity (dB) 100.5
Frequency from (Hz) 45
Frequency to (Hz) 3200
Abmessungen & Korb
Diameter 15
Voice coil (inch) 2.5
Mounting depth (mm) 210
Weight (kg) 3.8
Thiele-Small-Parameter
Re (Ω) 5.1
Le (mH) 0.65
Fs (Hz) 45
Qms 8.9
Qes 0.31
Qts 0.3
Vas (l) 143
Xmax (mm) 8
BL (Tm) 21.2
Mms (kg) 0.095
Sd (m²) 0.0881