Eighteen Sound 6NMB900

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.7dB
• Frequency response 200 - 7000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 95Hz
• Mechanical quality factor QMS 2.87
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 3mm
• Air volume displaced at xmax VD 39cm³
• Power handling P 200W
• Program power Pmax 260W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 0.1mH
• VC Diameter 44mm
• Winding material Aluminum

Magnet

• Force factor Bl 8.5N/A
• Motor constant Bl/√RE 3.73N/√W
• Material Neodymium

Diaphragm

• Effective diameter 129mm
• Effective area SD 130cm²
• Moving mass MMS 7.4g
• Moving mass (without air load) MMD 6.3g
• Material Weather protected

Suspensions

• Stiffness KMS 2.64N/mm
• Compliance CMS 379µm/N
• Equivalent volume to the compliance VAS 10.3L
• Mechanical resistance RMS 1.54N·s/m

Dimensions

• Nominal diameter 6.5″
• 152mm
• Overall diameter 162mm
• Baffle cutout diameter 148mm
• Overall depth 73mm
• Flange thickness 11mm
• Mounting depth 62mm
• Volume occupied by the driver (estimated) 0.41L
• Net weight 1.25kg