SB Acoustics SB15SFCR39-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.7dB

Thiele & Small parameters

• Resonance frequency (free air) fS 31Hz
• Mechanical quality factor QMS 6.57
• Electrical quality factor QES 0.34
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 5.5mm
• Air volume displaced at xmax VD 98cm³
• Power handling P 80W
• Program power Pmax 160W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.5Ω
• Inductance (1kHz) LE 0.91mH
• VC Diameter 38.5mm
• Winding height HVC 17mm

Magnet

• Flux density B 0.94T
• Force factor Bl 6.9N/A
• Motor constant Bl/√RE 3.69N/√W
• Air gap height HAG 6mm
• Weight 0.54kg

Diaphragm

• Effective diameter 151mm
• Effective area SD 178cm²
• Moving mass MMS 23.6g
• Moving mass (without air load) MMD 22.7g
• Material Paper

Suspensions

• Stiffness KMS 0.901N/mm
• Compliance CMS 1110µm/N
• Equivalent volume to the compliance VAS 49.9L
• Mechanical resistance RMS 0.7N·s/m
• Surround material Rubber

Dimensions

• Nominal size 5 x 8″
• 127 x 203mm
• Volume occupied by the driver (estimated) 0.67L
• Net weight 1.65kg