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18SOUND 21NTLW5000

18SOUND 21NTLW5000

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18SOUND (Eighteen Sound) 21NTLW5000 — 21" / 21 inch · Super-Performance Woofer · Subwoofer / Bass · Neodymium · Dual-Gap
2x4.5" voice coil · 4/8 Ω
Part no.: 42A-CHS-TT-18S-0032

775.00 € 775.0 EUR 775.00 €

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  • 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 21NTLW5000 — 21" · Woofer

1800 W AES · 97 dB Sensitivity · Frequency range 30 Hz – 1800 Hz

Technical data

  • Diameter: 21 "
  • Voice coil: 4.5 "
  • Power handling: 1800 W AES
  • Sensitivity: 97 dB
  • Impedance: 8 Ω
  • Magnet: Neo
  • Weight: 12.5 kg
  • Mounting depth: 320 mm
  • Frequency range: 30 – 1800 Hz

Datasheet (PDF) · Manufacturer page

Series: NTLW · Part no.: 42A-CHS-TT-18S-0032

Thiele-Small parameters

Nominal impedance8 Ω
Resonance frequency fs31 Hz
Total Q Qts0.36
Electrical Q Qes0.38
Mechanical Q Qms5.2
Equivalent volume Vas270.0 l
Moving mass Mms372.0 g
Cone area Sd1.662 cm²
Linear excursion Xmax17.5 mm
Force factor BL32 Tm
DC resistance Re5.3 Ω
Voice coil inductance Le1.6 mH

Enclosure suggestion

The EBP of 82 is in the intermediate range — either works; sealed plays tighter, bass reflex deeper and louder. EBP = fs / Qes = 31 / 0.38

Sealed (Qtc 0.707)

Enclosure volume Vb
94.5 l
System resonance Fc
61 Hz
Cut-off frequency F3
61 Hz

Bass reflex (QB3 after Small)

Enclosure volume Vb
185.4 l
Tuning frequency Fb
35 Hz
Cut-off frequency F3
37 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) 1800
Sensitivity (dB) 97
Frequency from (Hz) 30
Frequency to (Hz) 1800
Abmessungen & Korb
Diameter 21
Voice coil (inch) 4.5
Mounting depth (mm) 320
Weight (kg) 12.5
Thiele-Small-Parameter
Re (Ω) 5.3
Le (mH) 1.6
Fs (Hz) 31
Qms 5.2
Qes 0.38
Qts 0.36
Vas (l) 270
Xmax (mm) 17.5
BL (Tm) 32
Mms (kg) 0.372
Sd (m²) 0.1662