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18SOUND 12W750

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18SOUND (Eighteen Sound) 12W750 — 12" / 12 inch · Woofer/Midrange (WM) · Bass · Ferrite
3" voice coil · 16 Ω
Part no.: 42A-CHS-TT-18S-0025

239.00 € 239.0 EUR 239.00 €

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18SOUND 12W750 — 12" · Woofer

600 W AES · 98 dB Sensitivity · Frequency range 50 Hz – 4600 Hz

Technical data

  • Diameter: 12 "
  • Voice coil: 3 "
  • Power handling: 600 W AES
  • Sensitivity: 98 dB
  • Impedance: 16 Ω
  • Magnet: Ferrite
  • Weight: 7.5 kg
  • Mounting depth: 148 mm
  • Frequency range: 50 – 4600 Hz

Datasheet (PDF) · Manufacturer page

Series: W · Part no.: 42A-CHS-TT-18S-0025

18Sound 12W750: 16 Ω ferrite woofer with 98 dB for multi-driver boxes and bass reflex

The 18Sound 12W750 is a 12" ferrite woofer from the W series with a 3" voice coil, 600 W AES and 98 dB sensitivity. The version listed here has a nominal impedance of 16 Ω with Re 10.4 Ω – a variant that makes most sense when several drivers are to hang in parallel on one amplifier channel. Two in parallel give 8 Ω with double the power handling and more cone area.

The motor is strong at 23.5 Tm and the moving mass low at 55 g – hence the high efficiency and the frequency range up to 4,600 Hz. Fs 55 Hz, Qts 0.33, Vas 61 l and Xmax 8 mm suit a woofer/midrange working in a bass-reflex enclosure. The 1.2 mH inductance is less critical at 16 Ω relative to the impedance than it would be with an 8 Ω coil. At 7.5 kg and 148 mm mounting depth it is a typical ferrite driver.

Use and enclosure

With an EBP of 157 bass reflex is the appropriate enclosure type. The guideline is 38 l net tuned to 63 Hz with an f3 around 68 Hz. For a 2x12" box with two 16 Ω drivers in parallel you double the volume accordingly; such a top has plenty of headroom with 98 dB per driver and an 8 Ω total load. Sealed, 17 l gives a system resonance of 118 Hz, useful as a low-mid chamber in a 3-way system. The enclosure calculator on 42.audio provides the exact figures for your design.

The 4,600 Hz upper limit allows a crossover to a 1" compression driver with a horn from the 18Sound range to sit somewhat higher; because of the beaming of a 12" driver a lower crossover still makes sense. At 16 Ω an amplifier delivers only a fraction of its 8 Ω power, which you need to keep in mind when choosing an amplifier for a single driver.

What to look out for

  • 16 Ω, Re 10.4 Ω – ideal for wiring two drivers in parallel to 8 Ω.
  • Single driver: an amplifier delivers noticeably less power into 16 Ω.
  • BL 23.5 Tm with Mms 55 g – strong motor, 98 dB.
  • 7.5 kg ferrite magnet, mounting depth 148 mm.
  • Bass-reflex guideline 38 l at 63 Hz.

Frequently asked questions

Why 16 Ω instead of 8 Ω?

For boxes with two or four drivers: two 16 Ω woofers in parallel give 8 Ω, and four in series-parallel do the same. That keeps the amplifier on a standard load. For a single driver a lower impedance is usually more practical because the amplifier can deliver more power.

How does the 12W750 differ from the 12LW801?

Same Qts of 0.33, but the 12W750 has 61 l Vas versus 41 l for the 12LW801. It therefore needs a slightly larger reflex box but delivers more level with its 98 dB. Both are in the driver database on 42.audio.

Which enclosure for a 2x12" box?

Around 38 l bass reflex per driver tuned to 63 Hz, so roughly double the volume for two. Wire the two 16 Ω drivers in parallel to 8 Ω. Set port area and length with the enclosure calculator on 42.audio.

At 42.audio you get the 18SOUND 12W750 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 impedance16 Ω
Resonance frequency fs55 Hz
Total Q Qts0.33
Electrical Q Qes0.35
Mechanical Q Qms5.8
Equivalent volume Vas61.0 l
Moving mass Mms55.0 g
Cone area Sd531 cm²
Linear excursion Xmax8 mm
Force factor BL23.5 Tm
DC resistance Re10.4 Ω
Voice coil inductance Le1.2 mH

Enclosure suggestion

The EBP of 157 suggests a bass-reflex enclosure. EBP = fs / Qes = 55 / 0.35

Sealed (Qtc 0.707)

Enclosure volume Vb
17.0 l
System resonance Fc
118 Hz
Cut-off frequency F3
118 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
31.4 l
Tuning frequency Fb
68 Hz
Cut-off frequency F3
74 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) 16
Power handling (W) 600
Sensitivity (dB) 98
Frequency from (Hz) 50
Frequency to (Hz) 4600
Abmessungen & Korb
Diameter 12
Voice coil (inch) 3
Mounting depth (mm) 148
Weight (kg) 7.5
Thiele-Small-Parameter
Re (Ω) 10.4
Le (mH) 1.2
Fs (Hz) 55
Qms 5.8
Qes 0.35
Qts 0.33
Vas (l) 61
Xmax (mm) 8
BL (Tm) 23.5
Mms (kg) 0.055
Sd (m²) 0.0531