Eighteen Sound 8NMB420 8Ω

8Ω

Woofer

Nominal diameter	8″ / 200 mm
Resonance	61 Hz
Q factor	0.28
Sensitivity	96 dB
Linear excursion	± 5.8 mm
Program power	400 W

Eighteen Sound 8NMB420 8Ω Woofer

Specifications

Sensitivity (1W, 1m, infinite baffle) SPL1W 96dB
Frequency response 60 - 5500Hz

Thiele & Small parameters

Resonance frequency (free air) fS 61Hz
Mechanical quality factor QMS 4.00
Electrical quality factor QES 0.31
Total quality factor QTS 0.28

Large signal parameters

Maximum linear excursion (one way) xmax 5.8mm
Air volume displaced at xmax VD 133cm³
Power handling P 280W
Program power Pmax 400W

Voice Coil

Nominal impedance Z 8Ω
DC resistance RE 5.0Ω
Inductance (1kHz) LE 0.35mH
VC Diameter 51mm

Magnet

Force factor Bl 10N/A
Motor constant Bl/√RE 4.47N/√W
Material Neodymium

Diaphragm

Effective diameter 171mm
Effective area SD 230cm²
Moving mass (including air load) MMS 14.9g
Moving mass MMD 12.4g

Suspensions

Stiffness KMS 2.19N/mm
Compliance CMS 457µm/N
Equivalent volume to the compliance VAS 33L
Mechanical resistance RMS 1.43N·s/m

Dimensions

Nominal diameter 8″
200mm
Overall diameter 210mm
Baffle cutout diameter 186mm
Overall depth 99mm
Flange thickness 14mm
Mounting depth 85mm
Volume occupied by the driver (estimated) 0.72L
Net weight 1.7kg

Eighteen Sound 8NMB420 8Ω SPL

Eighteen Sound 8NMB420 8Ω Dimensions

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fS	59 Hz
SD	227 cm²
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fS	45 Hz
SD	210 cm²
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fS	45 Hz
SD	210 cm²
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