Eighteen Sound 12MB710

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.2dB
• Frequency response 90 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 46Hz
• Mechanical quality factor QMS 10.30
• Electrical quality factor QES 0.20
• Total quality factor QTS 0.20

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 266cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 0.79mH
• VC Diameter 75mm
• Winding height HVC 15mm
• Winding material Copper

Magnet

• Force factor Bl 20.5N/A
• Motor constant Bl/√RE 9.17N/√W
• Air gap height HAG 10mm
• Material Ferrite

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 59g
• Moving mass (without air load) MMD 50.4g
• Material Weather protected

Suspensions

• Stiffness KMS 4.93N/mm
• Compliance CMS 203µm/N
• Equivalent volume to the compliance VAS 81L
• Mechanical resistance RMS 1.66N·s/m

Dimensions

• Nominal diameter 12″
• 310mm
• Overall diameter 310mm
• Baffle cutout diameter 283mm
• Overall depth 142mm
• Flange thickness 13mm
• Mounting depth 129mm
• Volume occupied by the driver (estimated) 3.1L
• Net weight 7.8kg