SB Acoustics SB13PFCR25-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.9dB

Thiele & Small parameters

• Resonance frequency (free air) fS 44Hz
• Mechanical quality factor QMS 2.60
• Electrical quality factor QES 0.33
• Total quality factor QTS 0.29

Large signal parameters

• Maximum linear excursion xmax 4.5mm
• Air volume displaced at xmax VD 39cm³
• Power handling P 40W
• Program power Pmax 80W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz) LE 0.56mH
• VC Diameter 25.4mm
• Winding height HVC 14mm

Magnet

• Flux density B 1.06T
• Force factor Bl 5.3N/A
• Motor constant Bl/√RE 2.96N/√W
• Air gap height HAG 5mm
• Weight 0.36kg

Diaphragm

• Effective diameter 105mm
• Effective area SD 87cm²
• Moving mass MMS 10.5g
• Moving mass (without air load) MMD 9.9g
• Material Natural fibers (made in-house)

Suspensions

• Stiffness KMS 0.8N/mm
• Compliance CMS 1250µm/N
• Equivalent volume to the compliance VAS 13.4L
• Mechanical resistance RMS 1.1N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 5″
• 127mm
• Volume occupied by the driver (estimated) 0.36L
• Net weight 0.91kg
• Frame material Reinforced plastic