Eighteen Sound 15MB650

• Sensitivity (1W, 1m, infinite baffle) SPL1W 98.1dB
• Frequency response 50 - 4800Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 40Hz
• Mechanical quality factor QMS 3.95
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 360cm³
• Power handling P 400W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 1.36mH
• VC Diameter 75mm
• Winding material Copper

Magnet

• Force factor Bl 20N/A
• Motor constant Bl/√RE 8.53N/√W
• Material Ferrite

Diaphragm

• Effective diameter 339mm
• Effective area SD 900cm²
• Moving mass MMS 77g
• Moving mass (without air load) MMD 58.7g
• Material Weather protected

Suspensions

• Stiffness KMS 4.85N/mm
• Compliance CMS 206µm/N
• Equivalent volume to the compliance VAS 210L
• Mechanical resistance RMS 4.9N·s/m

Dimensions

• Nominal diameter 15″
• 380mm
• Overall diameter 387mm
• Baffle cutout diameter 353mm
• Overall depth 167mm
• Flange thickness 19mm
• Mounting depth 148mm
• Volume occupied by the driver (estimated) 4.2L
• Net weight 8.3kg