SB Acoustics SB12PFCR25-4-COAX

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.9dB

Thiele & Small parameters

• Resonance frequency (free air) fS 58Hz
• Mechanical quality factor QMS 4.07
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.33

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 23cm³
• Power handling P 30W
• Program power Pmax 60W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 0.26mH
• VC Diameter 25.4mm
• Winding height HVC 15mm

Magnet

• Flux density B 1T
• Force factor Bl 3.8N/A
• Motor constant Bl/√RE 2.16N/√W
• Air gap height HAG 5mm
• Weight 0.4kg

Diaphragm

• Effective diameter 76mm
• Effective area SD 45cm²
• Moving mass MMS 4.5g
• Moving mass (without air load) MMD 4.3g
• Material Natural fibers (made in-house)

Suspensions

• Stiffness KMS 0.602N/mm
• Compliance CMS 1660µm/N
• Equivalent volume to the compliance VAS 4.8L
• Mechanical resistance RMS 0.4N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.34L
• Net weight 0.86kg
• Frame material Reinforced plastic