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18SOUND 12NTLW3500

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18SOUND (Eighteen Sound) 12NTLW3500 — 12" / 12 inch · Woofer/Midrange (WM) · Bass · Neodymium · Dual-Gap
2x3.5" voice coil · 8 Ω
Part no.: 42A-CHS-TT-18S-0059

393.00 € 393.0 EUR 393.00 €

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18SOUND 12NTLW3500 — 12" · Woofer

900 W AES · 97 dB Sensitivity · Frequency range 50 Hz – 3000 Hz

Technical data

  • Diameter: 12 "
  • Voice coil: 3.5 "
  • Power handling: 900 W AES
  • Sensitivity: 97 dB
  • Impedance: 8 Ω
  • Magnet: Neo
  • Weight: 4.7 kg
  • Mounting depth: 193 mm
  • Frequency range: 50 – 3000 Hz

Datasheet (PDF) · Manufacturer page

Series: NTLW · Part no.: 42A-CHS-TT-18S-0059

18Sound 12NTLW3500: 900 W dual-gap woofer for loud, compact 12" tops

900 W AES from a 12" driver weighing just 4.7 kg – that is the combination that makes the 18Sound 12NTLW3500 interesting. The neodymium motor with two air gaps and a 2x3.5" voice coil spreads the heat across two windings and keeps inductance very low at 0.46 mH. Sensitivity is 97 dB and the frequency range 50 to 3,000 Hz.

With Fs 53 Hz, Qts 0.33, Vas 45 l and Xmax 8.3 mm the woofer/midrange is laid out for compact reflex enclosures. The 19.5 Tm motor and the 80 g moving mass result in a driver that converts power into level without giving up efficiency. The Qms of 8 points to a low-loss suspension. The 8 Ω version with Re 5.1 Ω is the one listed in the shop; the woofer is also made in 4 and 16 Ω.

Use and enclosure

The EBP of 151 points to bass reflex. The guideline is 28 l net tuned to 60 Hz with an f3 around 65 Hz – a compact, very robust top or a stage monitor with plenty of level headroom. Sealed, you get 13 l with a 114 Hz system resonance, a suitable low-mid chamber in a 3-way box. Work out volume and port dimensions for your cabinet with the enclosure calculator on 42.audio.

Usable to 3,000 Hz, the 12NTLW3500 is the partner for a 1.4" compression driver and horn combination from 18Sound's Horns & Waveguides category, letting you set the crossover low. The low Le keeps the crossover predictable. With 900 W AES, size the amplifier accordingly and place a high-pass below the tuning frequency so excursion stays controlled at 8.3 mm Xmax.

What to look out for

  • 900 W AES at 8 Ω, Re 5.1 Ω – an amplifier with decent headroom.
  • Dual-gap motor: Le 0.46 mH, two windings for heat dissipation.
  • Mounting depth 193 mm – deeper than the classic ND models.
  • Only 4.7 kg despite the high power handling.
  • Bass-reflex guideline 28 l at 60 Hz.

Frequently asked questions

12NTLW3500 or 12NW350 – what is the difference?

Both have Fs around 53 to 54 Hz, Qts 0.33 to 0.34 and a Vas around 45 to 46 l, so they are nearly interchangeable in the cabinet. The 12NTLW3500 offers 900 W with a dual-gap motor and 0.46 mH, while the 12NW350 uses a classic 3.5" single coil with correspondingly higher inductance. The NTLW is the choice when power and impedance behaviour come first.

Why two air gaps?

Two windings in two gaps double the area available for heat transfer and allow a shorter magnetic circuit with lower inductance. The result is 900 W AES at 0.46 mH and a motor that works more evenly over the excursion than a long single coil.

Does it fit a small top with a subwoofer?

Yes, 28 l bass reflex tuned to 60 Hz with a hand-over to the sub is exactly the intended use. The 8.3 mm Xmax and 900 W give enough reserve to stay clean above the crossover even at high levels.

At 42.audio you get the 18SOUND 12NTLW3500 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 fs53 Hz
Total Q Qts0.33
Electrical Q Qes0.35
Mechanical Q Qms8
Equivalent volume Vas45.0 l
Moving mass Mms80.0 g
Cone area Sd531 cm²
Linear excursion Xmax8.3 mm
Force factor BL19.5 Tm
DC resistance Re5.1 Ω
Voice coil inductance Le0.46 mH

Enclosure suggestion

The EBP of 151 suggests a bass-reflex enclosure. EBP = fs / Qes = 53 / 0.35

Sealed (Qtc 0.707)

Enclosure volume Vb
12.5 l
System resonance Fc
114 Hz
Cut-off frequency F3
114 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
23.2 l
Tuning frequency Fb
65 Hz
Cut-off frequency F3
71 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) 900
Sensitivity (dB) 97
Frequency from (Hz) 50
Frequency to (Hz) 3000
Abmessungen & Korb
Diameter 12
Voice coil (inch) 3.5
Mounting depth (mm) 193
Weight (kg) 4.7
Thiele-Small-Parameter
Re (Ω) 5.1
Le (mH) 0.46
Fs (Hz) 53
Qms 8
Qes 0.35
Qts 0.33
Vas (l) 45
Xmax (mm) 8.3
BL (Tm) 19.5
Mms (kg) 0.08
Sd (m²) 0.0531