SB Acoustics SB13PFCR25-4-COAX

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.3dB

Thiele & Small parameters

• Resonance frequency (free air) fS 43Hz
• Mechanical quality factor QMS 2.26
• Electrical quality factor QES 0.30
• Total quality factor QTS 0.27

Large signal parameters

• Maximum linear excursion xmax 4.7mm
• Air volume displaced at xmax VD 38cm³
• Power handling P 40W
• Program power Pmax 80W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz) LE 0.3mH
• VC Diameter 25.4mm
• Winding height HVC 14.3mm

Magnet

• Flux density B 1.1T
• Force factor Bl 5.1N/A
• Motor constant Bl/√RE 2.85N/√W
• Air gap height HAG 5mm
• Weight 0.36kg

Diaphragm

• Effective diameter 102mm
• Effective area SD 82cm²
• Moving mass MMS 9.1g
• Moving mass (without air load) MMD 8.6g
• Material Natural fibers (made in-house)

Suspensions

• Stiffness KMS 0.662N/mm
• Compliance CMS 1510µm/N
• Equivalent volume to the compliance VAS 14.4L
• Mechanical resistance RMS 1.1N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 5″
• 127mm
• Volume occupied by the driver (estimated) 0.37L
• Net weight 0.93kg
• Frame material Reinforced plastic