Eighteen Sound 8MB500 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.4dB
• Frequency response 60 - 4500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 74Hz
• Mechanical quality factor QMS 2.66
• Electrical quality factor QES 0.51
• Total quality factor QTS 0.43

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 138cm³
• Power handling P 280W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.1Ω
• Inductance (1kHz) LE 0.6mH
• VC Diameter 51mm
• Winding material Aluminum

Magnet

• Force factor Bl 9N/A
• Motor constant Bl/√RE 3.99N/√W
• Material Ferrite

Diaphragm

• Effective diameter 171mm
• Effective area SD 230cm²
• Moving mass MMS 17g
• Moving mass (without air load) MMD 14.5g
• Material Weather protected

Suspensions

• Stiffness KMS 3.68N/mm
• Compliance CMS 272µm/N
• Equivalent volume to the compliance VAS 21.5L
• Mechanical resistance RMS 2.97N·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) 1.1L
• Net weight 3.4kg