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18SOUND 18NTLS5000

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18SOUND (Eighteen Sound) 18NTLS5000 — 18" / 18 inch · Hi-Fi/Cinema Woofer · Subwoofer / Bass · Neodymium · Dual-Gap
2x4.5" voice coil · 4 Ω
Part no.: 42A-CHS-TT-18S-0043

903.00 € 903.0 EUR 903.00 €

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  • Magnet
  • Impedance (Ω)
  • Power handling (W)
  • Sensitivity (dB)
  • Frequency from (Hz)
  • Frequency to (Hz)
  • Diameter
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  • Mounting depth (mm)
  • Weight (kg)
  • Re (Ω)
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  • Fs (Hz)
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  • Vas (l)
  • Xmax (mm)
  • BL (Tm)
  • Mms (kg)
  • Sd (m²)

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18SOUND 18NTLS5000 — 18" · Woofer

1800 W AES · 89 dB Sensitivity · Frequency range 35 Hz – 4000 Hz

Technical data

  • Diameter: 18 "
  • Voice coil: 4.5 "
  • Power handling: 1800 W AES
  • Sensitivity: 89 dB
  • Impedance: 4 Ω
  • Magnet: Neo
  • Weight: 13.6 kg
  • Mounting depth: 330 mm
  • Frequency range: 35 – 4000 Hz

Datasheet (PDF) · Manufacturer page

Series: NTLS · Part no.: 42A-CHS-TT-18S-0043

18Sound 18NTLS5000: 18" long-excursion subwoofer with 17.75 mm Xmax for cinema and hi-fi

The 18NTLS5000 is an 18" woofer from 18Sound's NTLS series, built as a subwoofer for hi-fi and cinema use. The basics: neodymium motor, dual-gap topology with two 4.5" voice coils, 4 Ω nominal impedance and 1800 W power handling. What stands out is the moving mass of 0.51 kg. Combined with a force factor of 30.7 Tm, it yields a resonance of 37 Hz with a Vas of just 75 l.

Sensitivity of 89 dB is well below what you expect from an 18" PA driver, and that is by design. This driver trades efficiency for excursion and compact enclosures: 17.75 mm Xmax and a small Vas allow deep tunings in volumes where a conventional PA woofer simply would not work. For home cinema, studio subwoofers or compact installations with plenty of amplifier power, that is exactly the right recipe. Within the 18Sound range, the 18NTLS5000 is closer to a hi-fi long-throw driver than to a touring bass.

Use and enclosure

An EBP of 106 points towards bass reflex. As a guideline derived from the Thiele-Small parameters, a vented box of around 47 l tuned to 42 Hz gives a lower cut-off near 45 Hz. Sealed with a Butterworth alignment, you get roughly 21 l with fc at 79 Hz – no deep bass on its own, but with 17.75 mm Xmax and active equalisation a workable basis for a very compact, electronically corrected subwoofer. Use the enclosure calculator at 42.audio for the exact alignment.

Crossover points are typically low, in subwoofer territory; the response starts at 35 Hz. With 4 Ω and Re of 2.7 Ω, the driver needs an amplifier that delivers current into low loads without complaint. This is where the dual-gap motor pays off: heat from the two voice coils is dissipated through two air gaps.

What to look out for

  • 4 Ω nominal, Re 2.7 Ω: the amplifier must drive low loads continuously
  • Mounting depth 330 mm – allow room for magnet and excursion in compact boxes
  • 89 dB sensitivity: expect to need far more amplifier power than with PA 18" drivers
  • Two 4.5" voice coils in a dual-gap motor, 17.75 mm Xmax, Mms 0.51 kg
  • 13.6 kg despite neodymium – cone and motor are built heavy

Frequently asked questions

Is the 18NTLS5000 suitable for PA subwoofers?

It can be used that way, but 89 dB sensitivity and the long excursion are aimed at deep bass from small boxes, not maximum SPL per watt. For touring bass, a driver like the 18NLW4500 with the same Qts of 0.33 but 151 l Vas is the more common choice.

Which amplifier suits the 18NTLS5000?

One that drives 4 Ω continuously and delivers power in the region of the 1800 W rating. In home cinema you will often need less; what matters is current capability at Re 2.7 Ω and a high-pass filter below the tuning frequency.

How does it differ from the Beyma 18LEX1200Nd?

Both have Qts 0.33 and resonance around 36–37 Hz, but the Beyma has 219 l Vas while the 18NTLS5000 has only 75 l. The 18Sound needs a much smaller box for the same alignment but demands more amplifier power.

18Sound 18NTLS5000: 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 18NTLS5000 is a 18-inch woofer with neodymium magnet from the NTLS 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 18NTLS5000 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 impedance4 Ω
Resonance frequency fs37 Hz
Total Q Qts0.33
Electrical Q Qes0.35
Mechanical Q Qms8.4
Equivalent volume Vas75.0 l
Moving mass Mms510.0 g
Cone area Sd1,225 cm²
Linear excursion Xmax17.75 mm
Force factor BL30.7 Tm
DC resistance Re2.7 Ω
Voice coil inductance Le2 mH

Enclosure suggestion

The EBP of 106 suggests a bass-reflex enclosure. EBP = fs / Qes = 37 / 0.35

Sealed (Qtc 0.707)

Enclosure volume Vb
20.9 l
System resonance Fc
79 Hz
Cut-off frequency F3
79 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
38.7 l
Tuning frequency Fb
45 Hz
Cut-off frequency F3
50 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 NTLS
Magnet Neo
Impedance (Ω) 4
Power handling (W) 1800
Sensitivity (dB) 89
Frequency from (Hz) 35
Frequency to (Hz) 4000
Abmessungen & Korb
Diameter 18
Voice coil (inch) 4.5
Mounting depth (mm) 330
Weight (kg) 13.6
Thiele-Small-Parameter
Re (Ω) 2.7
Le (mH) 2
Fs (Hz) 37
Qms 8.4
Qes 0.35
Qts 0.33
Vas (l) 75
Xmax (mm) 17.75
BL (Tm) 30.7
Mms (kg) 0.51
Sd (m²) 0.1225