SB Acoustics SB23MFCL45-4

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

Thiele & Small parameters

• Resonance frequency (free air) fS 27Hz
• Mechanical quality factor QMS 7.70
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 12mm
• Air volume displaced at xmax VD 252cm³
• Power handling P 150W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz) LE 0.73mH
• VC Diameter 45.5mm
• Winding height HVC 32mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Flux density B 1.03T
• Force factor Bl 9.6N/A
• Motor constant Bl/√RE 5.28N/√W
• Air gap height HAG 8mm
• Weight 2.0kg

Diaphragm

• Effective diameter 164mm
• Effective area SD 210cm²
• Moving mass MMS 59g
• Moving mass (without air load) MMD 56.8g
• Material Polypropylene

Suspensions

• Stiffness KMS 1.7N/mm
• Compliance CMS 590µm/N
• Equivalent volume to the compliance VAS 37L
• Mechanical resistance RMS 1.3N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 8″
• 203mm
• Volume occupied by the driver (estimated) 2L
• Net weight 4.7kg
• Frame material Cast aluminium