Focal ACCESS 25 A4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 82.7dB
• Frequency response 36 - 500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 23.5Hz
• Mechanical quality factor QMS 5.06
• Electrical quality factor QES 0.56
• Total quality factor QTS 0.51

Large signal parameters

• Maximum linear excursion xmax 8.5mm
• Air volume displaced at xmax VD 281cm³
• Power handling P 200W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 4.2Ω
• 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 12.5N/A
• Motor constant Bl/√RE 6.08N/√W
• Air gap height HAG 8mm
• Diameter 120mm
• Height 30mm
• Weight 1.25kg

Diaphragm

• Effective diameter 205mm
• Effective area SD 330cm²
• Moving mass MMS 141g
• Moving mass (without air load) MMD 136g
• Material Dual Fiberglass Structure

Suspensions

• Stiffness KMS 3.07N/mm
• Compliance CMS 326µm/N
• Equivalent volume to the compliance VAS 49.9L
• Mechanical resistance RMS 4.11N·s/m
• Surround material Butyl

Dimensions

• Nominal diameter 10″
• 250mm
• Overall diameter 260mm
• Baffle cutout diameter 230mm
• Mounting depth 127mm
• Volume occupied by the driver (estimated) 1.5L
• Net weight 3.5kg