Eighteen Sound 8MB500

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.8dB
• Frequency response 60 - 4500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 73Hz
• Mechanical quality factor QMS 2.56
• Electrical quality factor QES 0.42
• Total quality factor QTS 0.36

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 4Ω
• DC resistance RE 2.6Ω
• Inductance (1kHz) LE 0.34mH
• VC Diameter 51mm

Magnet

• Force factor Bl 7.2N/A
• Motor constant Bl/√RE 4.47N/√W

Diaphragm

• Effective diameter 171mm
• Effective area SD 230cm²
• Moving mass MMS 18g
• Moving mass (without air load) MMD 15.5g

Suspensions

• Stiffness KMS 3.79N/mm
• Compliance CMS 264µm/N
• Equivalent volume to the compliance VAS 18.4L
• Mechanical resistance RMS 3.23N·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