Focal ACCESS 30 A4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.6dB
• Frequency response 32 - 500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 24.7Hz
• Mechanical quality factor QMS 5.49
• Electrical quality factor QES 0.76
• Total quality factor QTS 0.67

Large signal parameters

• Maximum linear excursion xmax 8.5mm
• Air volume displaced at xmax VD 434cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 4.0Ω
• Inductance (1kHz) LE 2.85mH
• VC Diameter 50mm
• Winding height HVC 25mm
• Winding material Copper
• Former material Kapton

Magnet

• Flux density B 0.8T
• Force factor Bl 11.9N/A
• Motor constant Bl/√RE 5.96N/√W
• Air gap height HAG 8mm
• Diameter 120mm
• Height 30mm
• Weight 1.25kg

Diaphragm

• Effective diameter 255mm
• Effective area SD 511cm²
• Moving mass MMS 175g
• Moving mass (without air load) MMD 167g
• Material Dual Fiberglass Structure

Suspensions

• Stiffness KMS 4.22N/mm
• Compliance CMS 237µm/N
• Equivalent volume to the compliance VAS 86.9L
• Mechanical resistance RMS 4.95N·s/m
• Surround material Butyl

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 315mm
• Baffle cutout diameter 273mm
• Mounting depth 147mm
• Volume occupied by the driver (estimated) 1.6L
• Net weight 3.7kg