Eighteen Sound 10NMB500

• Sensitivity (1W, 1m, infinite baffle) SPL1W 99.4dB
• Frequency response 70 - 6500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 67Hz
• Mechanical quality factor QMS 2.73
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 2.5mm
• Maximum excursion before damage xlim 9mm
• Air volume displaced at xmax VD 87cm³
• Power handling P 250W
• Program power Pmax 320W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 0.2mH
• VC Diameter 51mm
• Winding material Copper

Magnet

• Force factor Bl 11N/A
• Motor constant Bl/√RE 4.82N/√W
• Material Neodymium

Diaphragm

• Effective diameter 210mm
• Effective area SD 346cm²
• Moving mass MMS 20g
• Moving mass (without air load) MMD 15.3g
• Material Curvilinear profile high damping water resistant treated cellulose

Suspensions

• Stiffness KMS 3.53N/mm
• Compliance CMS 283µm/N
• Equivalent volume to the compliance VAS 48.1L
• Mechanical resistance RMS 3.08N·s/m
• Surround material Triple-roll, Polycotton

Dimensions

• Nominal diameter 10″
• 260mm
• Overall diameter 260mm
• Baffle cutout diameter 232mm
• Overall depth 122mm
• Flange thickness 15mm
• Mounting depth 107mm
• Volume occupied by the driver (estimated) 1L
• Net weight 1.9kg