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18SOUND 12NTLX3500

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18SOUND (Eighteen Sound) 12NTLX3500 — 12" / 12 inch · Hi-Fi/Studio Woofer · Bass · Neodymium · Dual-Gap
2x3.5" voice coil · 8 Ω
Part no.: 42A-CHS-TT-18S-0068

393.00 € 393.0 EUR 393.00 €

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18SOUND 12NTLX3500 — 12" · Woofer

600 W AES · 95.5 dB Sensitivity · Frequency range 40 Hz – 4000 Hz

Technical data

  • Diameter: 12 "
  • Voice coil: 3.46 "
  • Power handling: 600 W AES
  • Sensitivity: 95.5 dB
  • Impedance: 8 Ω
  • Magnet: Neo
  • Weight: 4.6 kg
  • Mounting depth: 194 mm
  • Frequency range: 40 – 4000 Hz

Datasheet (PDF) · Manufacturer page

Series: NTLX · Part no.: 42A-CHS-TT-18S-0068

18Sound 12NTLX3500: 12" hi-fi/studio woofer with Fs 39 Hz and dual-gap motor

With a resonance frequency of 39 Hz the 18Sound 12NTLX3500 is the lowest-tuned twelve in this range. It is laid out as a hi-fi and studio woofer: neodymium dual-gap motor with a 2x3.5" voice coil, 600 W AES, 95.5 dB sensitivity and a frequency range of 40 to 4,000 Hz. The 0.52 mH inductance keeps impedance flat into the midrange.

Qts 0.33, Vas 79.6 l, Xmax 7.9 mm and a moving mass of 86 g add up to a driver that carries deep bass in a medium-sized enclosure without losing control. The motor delivers 17.1 Tm, and the Qms of 6.2 is in the usual range. At 4.6 kg even a larger floor-standing cabinet stays manageable; the 194 mm mounting depth, however, has to be planned for.

Use and enclosure

The EBP of 111 pulls the decision towards bass reflex without ruling out sealed designs. The bass-reflex guideline is around 50 l net tuned to 44 Hz with an f3 near 48 Hz – a good ratio of volume to extension for hi-fi floorstanders or large studio monitors. Sealed, 22 l gives a system resonance of 84 Hz, quite practical with active equalisation in a studio monitor. The enclosure calculator on 42.audio helps you compare both options with your dimensions.

For a 2-way system with a tweeter crossed low, the range up to 4,000 Hz is sufficient; in 3-way designs the 12NTLX3500 takes the bass up into the fundamental range. The 600 W AES is more than enough reserve for home and studio; what matters more is an amplifier that behaves cleanly into 8 Ω with Re 5 Ω.

What to look out for

  • Fs 39 Hz, Vas 79.6 l – deep bass in around 50 l bass reflex.
  • Dual-gap motor with Le 0.52 mH: flat impedance, easy passive crossover.
  • Mounting depth 194 mm – build the cabinet deep enough.
  • 95.5 dB and 600 W AES: for hi-fi and studio, less so for sustained PA levels.
  • 4.6 kg thanks to neodymium.

Frequently asked questions

What distinguishes the 12NTLX3500 from the 12NTLW3500?

The 12NTLW3500 is the PA model with Fs 53 Hz and 45 l Vas for small reflex boxes. The 12NTLX3500 aims at extension for hi-fi and studio with Fs 39 Hz, 79.6 l Vas and 600 W. Same motor type, different tuning.

What volume for a hi-fi floorstander?

The guideline is a bass-reflex enclosure around 50 l net tuned to 44 Hz with f3 near 48 Hz. If you prefer it tighter, go sealed with 22 l and equalise the 84 Hz system resonance electronically.

Can the 12NTLX3500 also be used as a low-mid driver?

Yes, thanks to the 0.52 mH inductance and a range up to 4,000 Hz. In a 3-way system it is more of a bass driver, though, because its 79.6 l Vas and 39 Hz resonance are designed for extension. The frequency response is in the datasheet PDF.

At 42.audio you get the 18SOUND 12NTLX3500 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 Qts0.33
Electrical Q Qes0.35
Mechanical Q Qms6.2
Equivalent volume Vas79.6 l
Moving mass Mms86.0 g
Cone area Sd531 cm²
Linear excursion Xmax7.9 mm
Force factor BL17.1 Tm
DC resistance Re5 Ω
Voice coil inductance Le0.52 mH

Enclosure suggestion

The EBP of 111 suggests a bass-reflex enclosure. EBP = fs / Qes = 39 / 0.35

Sealed (Qtc 0.707)

Enclosure volume Vb
22.2 l
System resonance Fc
84 Hz
Cut-off frequency F3
84 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
41.0 l
Tuning frequency Fb
48 Hz
Cut-off frequency F3
52 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 NTLX
Magnet Neo
Impedance (Ω) 8
Power handling (W) 600
Sensitivity (dB) 95.5
Frequency from (Hz) 40
Frequency to (Hz) 4000
Abmessungen & Korb
Diameter 12
Voice coil (inch) 3.46
Mounting depth (mm) 194
Weight (kg) 4.6
Thiele-Small-Parameter
Re (Ω) 5
Le (mH) 0.52
Fs (Hz) 39
Qms 6.2
Qes 0.35
Qts 0.33
Vas (l) 79.6
Xmax (mm) 7.9
BL (Tm) 17.1
Mms (kg) 0.086
Sd (m²) 0.0531