SB Acoustics SB15MFC30-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.3dB

Thiele & Small parameters

• Resonance frequency (free air) fS 35.5Hz
• Mechanical quality factor QMS 5.26
• Electrical quality factor QES 0.30
• Total quality factor QTS 0.28

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 41cm³
• Power handling P 50W
• Program power Pmax 100W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 0.12mH
• VC Diameter 30.5mm
• Winding height HVC 15mm
• Winding material Copper Clad Aluminium
• Former material Glass Fiber

Magnet

• Flux density B 1T
• Force factor Bl 4.8N/A
• Motor constant Bl/√RE 2.73N/√W
• Air gap height HAG 5mm
• Weight 0.54kg

Diaphragm

• Effective diameter 102mm
• Effective area SD 82cm²
• Moving mass MMS 9.9g
• Moving mass (without air load) MMD 9.4g
• Material Polypropylene

Suspensions

• Stiffness KMS 0.493N/mm
• Compliance CMS 2030µm/N
• Equivalent volume to the compliance VAS 19.4L
• Mechanical resistance RMS 0.42N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 5″
• 127mm
• Volume occupied by the driver (estimated) 0.6L
• Net weight 1.48kg
• Frame material Cast aluminium