Eighteen Sound 12NTLW2500

4Ω

Subwoofer

Nominal diameter	12″ / 310 mm
Resonance	52 Hz
Q factor	0.31
Sensitivity	95.4 dB
Linear excursion	± 7.6 mm
Program Power	1000 W

Eighteen Sound 12NTLW2500 Subwoofer

Specifications

Sensitivity (1W, 1m, infinite baffle) SPL1W 95.4dB
Frequency response 55 - 4500Hz

Thiele & Small parameters

Resonance frequency (free air) fS 52Hz
Mechanical quality factor QMS 10.20
Electrical quality factor QES 0.32
Total quality factor QTS 0.31

Large signal parameters

Maximum linear excursion xmax 7.6mm
Air volume displaced at xmax VD 404cm³
Power handling P 500W
Program power Pmax 1000W

Voice Coil

Nominal impedance Z 4Ω
DC resistance RE 2.8Ω
Inductance (1kHz) LE 0.31mH
VC Diameter 64mm
Winding height HVC 19.7mm
Winding material Copper

Magnet

Force factor Bl 14.4N/A
Motor constant Bl/√RE 8.61N/√W
Air gap height HAG 9mm
Material Neodymium

Diaphragm

Effective diameter 260mm
Effective area SD 531cm²
Moving mass MMS 71g
Moving mass (without air load) MMD 62.4g
Material Weather protected

Suspensions

Stiffness KMS 7.75N/mm
Compliance CMS 129µm/N
Equivalent volume to the compliance VAS 52.7L
Mechanical resistance RMS 2.27N·s/m

Dimensions

Nominal diameter 12″
310mm
Overall diameter 310mm
Baffle cutout diameter 283mm
Overall depth 175mm
Flange thickness 13mm
Mounting depth 162mm
Volume occupied by the driver (estimated) 2.2L
Net weight 3.6kg

Eighteen Sound 12NTLW2500 SPL

Eighteen Sound 12NTLW2500 Dimensions

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