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18SOUND 15W750

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18SOUND (Eighteen Sound) 15W750 — 15" / 15 inch · Woofer/Midrange (WM) · Subwoofer / Bass · Ferrite
3" voice coil · 8 Ω
Part no.: 42A-CHS-TT-18S-0018

265.00 € 265.0 EUR 265.00 €

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  • Power handling (W)
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  • Frequency to (Hz)
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  • Sd (m²)

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18SOUND 15W750 — 15" · Woofer

600 W AES · 97 dB Sensitivity · Frequency range 50 Hz – 4300 Hz

Technical data

  • Diameter: 15 "
  • Voice coil: 3 "
  • Power handling: 600 W AES
  • Sensitivity: 97 dB
  • Impedance: 8 Ω
  • Magnet: Ferrite
  • Weight: 7.9 kg
  • Mounting depth: 184 mm
  • Frequency range: 50 – 4300 Hz

Datasheet (PDF) · Manufacturer page

Series: W · Part no.: 42A-CHS-TT-18S-0018

18Sound 15W750: 15" ferrite woofer with 600 W and 8 mm Xmax for bass and mids

The 15W750 is the higher-rated of the two 3" models in 18Sound's W series. 600 W AES, 8 mm linear excursion and a ferrite magnet make a robust 15" driver that, with 97 dB sensitivity and a stated range of 50 Hz to 4300 Hz, covers bass and lower midrange. Weight is 7.9 kg, mounting depth 184 mm.

With Fs 39 Hz, Qts 0.37, Qes 0.39 and Vas 218 l the 15W750 sits in a parameter region that allows large vented boxes with real extension. The moving mass of 88 g and BL 17.6 Tm keep efficiency high, and the high Qms of 9.34 indicates a suspension with little mechanical damping. The 1.1 mH inductance is low for a 3" coil.

Use and enclosure

The EBP of 100 sits exactly on the boundary between sealed and vented; in practice vented is the better choice for extension. The guide value from the TSP is generous: about 188 l net tuned to 40 Hz with an f3 near 41 Hz. That is subwoofer extension from a driver that also plays up to 4300 Hz – interesting for large 2-way full-range boxes or bass guitar. Sealed gives roughly 82 l at fc 75 Hz, which works as a mid chamber in a 3-way system or as a compact bass with subwoofer support. Check both routes in the enclosure calculator at 42.audio.

In a 2-way box with a horn you cross well below 4300 Hz; suitable horns are in the 18Sound horns & waveguides category. With low tuning and high power a high-pass below fb makes sure the 8 mm excursion is not exceeded.

What to look out for

  • 600 W AES into 8 Ω (Re 5.1 Ω), 3" voice coil, Xmax 8 mm.
  • 97 dB sensitivity, stated range 50–4300 Hz.
  • Ferrite magnet, 7.9 kg, mounting depth 184 mm.
  • Vas 218 l: vented guide value 188 l for f3 near 41 Hz, sealed around 82 l.

Frequently asked questions

What distinguishes the 15W750 from the 15ND840?

Both have Qts 0.37, but the 15ND840 uses neodymium, has Fs 43 Hz and Vas 163 l. The 15W750 is heavier with ferrite, has the lower resonance at 39 Hz and needs a larger box because of its 218 l Vas. If you want to save weight, pick the 15ND840 in the shop.

Is the 15W750 suitable for a bass guitar cabinet?

Yes, 600 W, 8 mm excursion and 97 dB fit well. In a vented box around 188 l it reaches down to about 41 Hz; a smaller box with higher tuning is more practical for stage cabinets.

Which amplifier should I plan for?

An amplifier around 600 W into 8 Ω uses the power handling fully. Thanks to 97 dB you reach high levels with less power for most applications; more important is a high-pass if you tune low.

At 42.audio you get the 18SOUND 15W750 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 fs39 Hz
Total Q Qts0.37
Electrical Q Qes0.39
Mechanical Q Qms9.34
Equivalent volume Vas218.0 l
Moving mass Mms88.0 g
Cone area Sd850 cm²
Linear excursion Xmax8 mm
Force factor BL17.6 Tm
DC resistance Re5.1 Ω
Voice coil inductance Le1.1 mH

Enclosure suggestion

The EBP of 100 is in the intermediate range — either works; sealed plays tighter, bass reflex deeper and louder. EBP = fs / Qes = 39 / 0.39

Sealed (Qtc 0.707)

Enclosure volume Vb
82.2 l
System resonance Fc
75 Hz
Cut-off frequency F3
75 Hz

Bass reflex (QB3 after Small)

Enclosure volume Vb
163.9 l
Tuning frequency Fb
43 Hz
Cut-off frequency F3
44 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 W
Magnet Ferrite
Impedance (Ω) 8
Power handling (W) 600
Sensitivity (dB) 97
Frequency from (Hz) 50
Frequency to (Hz) 4300
Abmessungen & Korb
Diameter 15
Voice coil (inch) 3
Mounting depth (mm) 184
Weight (kg) 7.9
Thiele-Small-Parameter
Re (Ω) 5.1
Le (mH) 1.1
Fs (Hz) 39
Qms 9.34
Qes 0.39
Qts 0.37
Vas (l) 218
Xmax (mm) 8
BL (Tm) 17.6
Mms (kg) 0.088
Sd (m²) 0.085