RCF MB8N251

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.9dB
• Frequency response 60 - 3500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 68Hz
• Mechanical quality factor QMS 4.60
• Electrical quality factor QES 0.26
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 5mm
• Maximum excursion before damage xlim 20mm
• Air volume displaced at xmax VD 100cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.1Ω
• Inductance (1kHz) LE 1.3mH
• VC Diameter 63mm
• Winding height HVC 14mm
• Winding material Aluminium
• Former material Glass Fiber

Magnet

• Force factor Bl 15.2N/A
• Motor constant Bl/√RE 6.73N/√W
• Air gap height HAG 9mm

Diaphragm

• Effective diameter 165mm
• Effective area SD 200cm²
• Moving mass MMS 27g
• Moving mass (without air load) MMD 24.9g

Suspensions

• Stiffness KMS 5.03N/mm
• Compliance CMS 199µm/N
• Equivalent volume to the compliance VAS 13L
• Mechanical resistance RMS 2.51N·s/m

Dimensions

• Nominal diameter 8″
• 203mm
• Overall diameter 208mm
• Baffle cutout diameter 185mm
• Overall depth 102mm
• Volume occupied by the driver 0.6L
• Net weight 2.01kg