SB Acoustics SB12PFCR25-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.8dB

Thiele & Small parameters

• Resonance frequency (free air) fS 58Hz
• Mechanical quality factor QMS 3.40
• Electrical quality factor QES 0.49
• Total quality factor QTS 0.43

Large signal parameters

• Maximum linear excursion xmax 4.9mm
• Air volume displaced at xmax VD 25cm³
• 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 14.8mm

Magnet

• Flux density B 0.84T
• Force factor Bl 3.5N/A
• Motor constant Bl/√RE 1.99N/√W
• Air gap height HAG 5mm
• Weight 0.32kg

Diaphragm

• Effective diameter 80mm
• Effective area SD 50cm²
• Moving mass MMS 5.3g
• Moving mass (without air load) MMD 5g
• Material Natural fibers (made in-house)

Suspensions

• Stiffness KMS 0.704N/mm
• Compliance CMS 1420µm/N
• Equivalent volume to the compliance VAS 5.2L
• Mechanical resistance RMS 0.6N·s/m
• Surround material Butyl rubber

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.27L
• Net weight 0.7kg
• Frame material Reinforced plastic