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18SOUND 15ND840

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18SOUND (Eighteen Sound) 15ND840 — 15" / 15 inch · Woofer/Midrange (WM) · Subwoofer / Bass · Neodymium
3" voice coil · 8 Ω
Part no.: 42A-CHS-TT-18S-0053

293.00 € 293.0 EUR 293.00 €

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  • Re (Ω)
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18SOUND 15ND840 — 15" · Woofer

600 W AES · 99 dB Sensitivity · Frequency range 38 Hz – 4000 Hz

Technical data

  • Diameter: 15 "
  • Voice coil: 2.95 "
  • Power handling: 600 W AES
  • Sensitivity: 99 dB
  • Impedance: 8 Ω
  • Magnet: Neo
  • Weight: 4.7 kg
  • Mounting depth: 184 mm
  • Frequency range: 38 – 4000 Hz

Datasheet (PDF) · Manufacturer page

Series: ND · Part no.: 42A-CHS-TT-18S-0053

18Sound 15ND840: 15" neodymium woofer with 9.5 mm Xmax, 600 W AES and 0.43 mH

The 18Sound 15ND840 combines two qualities rarely found together in a 15" driver: 9.5 mm Xmax for solid displacement and a voice coil inductance of just 0.43 mH for clean mids. This neodymium driver from the ND series weighs 4.7 kg, handles 600 W AES on its 2.95" voice coil and delivers 99 dB sensitivity over a rated range of 38 to 4,000 Hz.

Among the Thiele-Small parameters, the Qts of 0.37 stands out as high for a PA driver, resulting from a force factor of 17.9 Tm acting on 94 g of moving mass. Fs is 43 Hz, Vas 163 l, Qms 6.6. The EBP of 110 sits at the lower edge of vented territory: the 15ND840 is thus a forgiving driver that reaches low in larger boxes and is not locked into a narrow tuning window.

Use and enclosure

On paper the 15ND840 wants a vented enclosure around 141 l tuned to 44 Hz, with a lower cut-off near 45 Hz. That is the alignment for a 2-way top meant to reproduce music without a subwoofer, or for a lightweight single-15" sub with good extension. The sealed version of roughly 61 l with a system resonance around 82 Hz is an option for midrange chambers in 3-way systems. The enclosure calculator at 42.audio provides the fine-tuning for smaller volumes.

The low inductance is the real trump card in 2-way use: 0.43 mH means a flat impedance curve, less phase rotation in the crossover region and therefore a simpler network, active or passive. Still, place the crossover to the compression driver well below 4,000 Hz to keep the cone's beaming under control. At 184 mm mounting depth the 15ND840 is one of the deeper neodymium 15" drivers, so the cabinet must provide the space.

What to look out for

  • Le 0.43 mH: very low inductance, straightforward crossover design in 2-way cabinets.
  • 9.5 mm Xmax at 600 W AES: considerably more excursion than the lighter models of the ND series.
  • Qts 0.37, Vas 163 l: low tuning in around 141 l, not a compact-box driver.
  • 4.7 kg, 184 mm mounting depth: light, but not shallow.
  • Re 5 Ω, 8 Ω nominal, also available as a 4 Ω version.

Frequently asked questions

How does the 15ND840 differ from the Beyma 15LEX1000Nd?

Both have Qts 0.37 and similar resonance, the Beyma at 41 Hz Fs. The Beyma fits a smaller box with 113 l Vas, while the 15ND840 with 163 l Vas needs more volume but brings an exceptionally low 0.43 mH inductance for 2-way use.

Is the 15ND840 suitable as a subwoofer?

Yes; with 9.5 mm Xmax and 600 W AES in a vented box around 141 l it reaches about 45 Hz in the guideline. For higher levels in the low bass there are drivers with larger voice coils and more excursion, but for lightweight compact subs it is a good choice.

Which crossover frequency to the tweeter?

The range extends to 4,000 Hz, but the crossover should sit well below that so the 15" cone does not beam excessively. Which horn and driver work best with it can be checked in the driver database at 42.audio.

At 42.audio you get the 18SOUND 15ND840 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 fs43 Hz
Total Q Qts0.37
Electrical Q Qes0.39
Mechanical Q Qms6.6
Equivalent volume Vas163.0 l
Moving mass Mms94.0 g
Cone area Sd881 cm²
Linear excursion Xmax9.5 mm
Force factor BL17.9 Tm
DC resistance Re5 Ω
Voice coil inductance Le0.43 mH

Enclosure suggestion

The EBP of 110 suggests a bass-reflex enclosure. EBP = fs / Qes = 43 / 0.39

Sealed (Qtc 0.707)

Enclosure volume Vb
61.5 l
System resonance Fc
82 Hz
Cut-off frequency F3
82 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
122.5 l
Tuning frequency Fb
47 Hz
Cut-off frequency F3
49 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 ND
Magnet Neo
Impedance (Ω) 8
Power handling (W) 600
Sensitivity (dB) 99
Frequency from (Hz) 38
Frequency to (Hz) 4000
Abmessungen & Korb
Diameter 15
Voice coil (inch) 2.95
Mounting depth (mm) 184
Weight (kg) 4.7
Thiele-Small-Parameter
Re (Ω) 5
Le (mH) 0.43
Fs (Hz) 43
Qms 6.6
Qes 0.39
Qts 0.37
Vas (l) 163
Xmax (mm) 9.5
BL (Tm) 17.9
Mms (kg) 0.094
Sd (m²) 0.0881