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18SOUND 21NLW4100

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18SOUND (Eighteen Sound) 21NLW4100 — 21" / 21 inch · High-Performance Woofer · Subwoofer / Bass · Neodymium
4" voice coil · 4 Ω
Part no.: 42A-CHS-TT-18S-0035

610.00 € 610.0 EUR 610.00 €

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  • Impedance (Ω)
  • Power handling (W)
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  • Frequency to (Hz)
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  • Mounting depth (mm)
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  • 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 21NLW4100 — 21" · Woofer

1500 W AES · 97 dB Sensitivity · Frequency range 32 Hz – 300 Hz

Technical data

  • Diameter: 21 "
  • Voice coil: 4 "
  • Power handling: 1500 W AES
  • Sensitivity: 97 dB
  • Impedance: 4 Ω
  • Magnet: Neo
  • Weight: 10.5 kg
  • Mounting depth: 245 mm
  • Frequency range: 32 – 300 Hz

Datasheet (PDF) · Manufacturer page

Series: NLW · Part no.: 42A-CHS-TT-18S-0035

18Sound 21NLW4100: 21" neodymium subwoofer with 15.2 mm Xmax at just 10.5 kg

10.5 kg for a 21" driver rated at 1500 W – the 21NLW4100 from 18Sound's NLW series shows what neodymium does for a motor. The 4" voice coil is wound for 4 Ω (Re 2.6 Ω), sensitivity is 97 dB and linear excursion 15.2 mm. The 32 to 300 Hz operating range makes it clear: this is a pure subwoofer driver.

The parameters fs 34 Hz, Qts 0.4 and Vas 219 l give a medium Q that also allows sealed enclosures. BL 22.8 Tm with Mms 0.4 kg is a moderate motor – the 21NLW4100 relies less on motor strength than on cone area (Sd 0.1661 m²) and excursion. For mobile subwoofers where every kilo counts, the combination of weight, excursion and power handling is the argument.

Use and enclosure

EBP 81 – both bass reflex and sealed are possible. The bass reflex guideline: about 237 l tuned to 33 Hz with f3 around 32 Hz, so deep bass without equalisation, but in a big box. Sealed, around 103 l with fc at 60 Hz is a compact alternative where the system amplifier's DSP equalisation restores the extension; 15.2 mm Xmax provides the reserve for that. The enclosure calculator at 42.audio shows how smaller reflex volumes with higher tuning behave.

At 4 Ω nominal a single driver makes good use of a PA amplifier's power; for dual-21 cabinets you need to plan the wiring, since two parallel 4 Ω drivers overload most amplifiers. The 245 mm mounting depth is uncritical.

What to look out for

  • 4 Ω, Re 2.6 Ω: for multiple drivers plan series wiring or separate channels
  • Only 10.5 kg thanks to neodymium – ideal for mobile subwoofers
  • Xmax 15.2 mm, power handling 1500 W
  • Qts 0.4: sealed boxes with equalisation are a genuine option
  • Operating range 32–300 Hz, pure subwoofer use

Frequently asked questions

How does the 21NLW4100 differ from the 21NLW5300?

The 21NLW5300 with Qts 0.32 and 325 l Vas is closer to a classic reflex sub, the 21NLW4100 with Qts 0.4 and 219 l has a higher Q and smaller Vas. That makes the 4100 more flexible in sealed or smaller boxes, and considerably lighter.

Which amplifier suits 4 Ω?

An amplifier that delivers around 1500 W continuously at 4 Ω. Two drivers in series give 8 Ω and can run on one channel; in parallel you would get 2 Ω, which most amplifiers cannot handle.

Does this driver make sense for home cinema?

Yes, especially sealed: around 103 l with fc at 60 Hz and DSP equalisation gives controlled deep bass, and 15.2 mm Xmax provides the necessary displacement. Bass reflex at 237 l gives more output without equalisation.

At 42.audio you get the 18SOUND 21NLW4100 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 fs34 Hz
Total Q Qts0.4
Electrical Q Qes0.42
Mechanical Q Qms7.8
Equivalent volume Vas219.0 l
Moving mass Mms400.0 g
Cone area Sd1,661 cm²
Linear excursion Xmax15.2 mm
Force factor BL22.8 Tm
DC resistance Re2.6 Ω
Voice coil inductance Le1.5 mH

Enclosure suggestion

The EBP of 81 is in the intermediate range — either works; sealed plays tighter, bass reflex deeper and louder. EBP = fs / Qes = 34 / 0.42

Sealed (Qtc 0.707)

Enclosure volume Vb
103.1 l
System resonance Fc
60 Hz
Cut-off frequency F3
60 Hz

Bass reflex (QB3 after Small)

Enclosure volume Vb
212.9 l
Tuning frequency Fb
34 Hz
Cut-off frequency F3
34 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) 4
Power handling (W) 1500
Sensitivity (dB) 97
Frequency from (Hz) 32
Frequency to (Hz) 300
Abmessungen & Korb
Diameter 21
Voice coil (inch) 4
Mounting depth (mm) 245
Weight (kg) 10.5
Thiele-Small-Parameter
Re (Ω) 2.6
Le (mH) 1.5
Fs (Hz) 34
Qms 7.8
Qes 0.42
Qts 0.4
Vas (l) 219
Xmax (mm) 15.2
BL (Tm) 22.8
Mms (kg) 0.4
Sd (m²) 0.1661