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18SOUND 21NLW4100

18SOUND 21NLW4100

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18SOUND (Eighteen Sound) 21NLW4100 — 21" / 21 inch · High-Performance Woofer · Subwoofer / Bass · Neodymium
4" voice coil · 4/8 Ω
Part no.: 42A-CHS-TT-18S-0035

610.01 € 610.01 EUR 610.01 €

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  • Manufacturer
  • Category
  • Series
  • Magnet
  • Impedance (Ω)
  • Power handling (W)
  • Sensitivity (dB)
  • Frequency from (Hz)
  • Frequency to (Hz)
  • Diameter
  • Voice coil (inch)
  • Mounting depth (mm)
  • Weight (kg)
  • Re (Ω)
  • Le (mH)
  • Fs (Hz)
  • Qms
  • Qes
  • Qts
  • 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

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