SB Acoustics SB42FHCL75-6

• Sensitivity (1W, 1m, infinite baffle) SPL1W 90.9dB

Thiele & Small parameters

• Resonance frequency (free air) fS 18.4Hz
• Mechanical quality factor QMS 7.40
• Electrical quality factor QES 0.32
• Total quality factor QTS 0.31

Large signal parameters

• Maximum linear excursion xmax 11.5mm
• Air volume displaced at xmax VD 978cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 6Ω
• DC resistance RE 4.6Ω
• Inductance (1kHz) LE 2.1mH
• VC Diameter 75.6mm
• Winding height HVC 31mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Flux density B 1.1T
• Force factor Bl 16.7N/A
• Motor constant Bl/√RE 7.79N/√W
• Air gap height HAG 8mm
• Weight 3.6kg

Diaphragm

• Effective diameter 329mm
• Effective area SD 850cm²
• Moving mass MMS 166g
• Moving mass (without air load) MMD 149g
• Material Hard paper honeycomb with fiber glass skin layers

Suspensions

• Stiffness KMS 2.22N/mm
• Compliance CMS 450µm/N
• Equivalent volume to the compliance VAS 462L
• Mechanical resistance RMS 2.6N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 15″
• 381mm
• Volume occupied by the driver (estimated) 4.6L
• Net weight 10.2kg
• Frame material Cast aluminium