Eighteen Sound 6NMB900 16Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.2dB
• Frequency response 200 - 7000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 100Hz
• Mechanical quality factor QMS 3.10
• Electrical quality factor QES 0.38
• Total quality factor QTS 0.34

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 16Ω
• DC resistance RE 10.1Ω
• Inductance (1kHz) LE 0.19mH
• VC Diameter 44mm

Magnet

• Force factor Bl 12.4N/A
• Motor constant Bl/√RE 3.9N/√W

Diaphragm

• Effective diameter 129mm
• Effective area SD 130cm²
• Moving mass MMS 9g
• Moving mass (without air load) MMD 7.9g

Suspensions

• Stiffness KMS 3.56N/mm
• Compliance CMS 281µm/N
• Equivalent volume to the compliance VAS 6.65L
• Mechanical resistance RMS 1.82N·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