Fostex P800K

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.3dB
• Frequency response 115 - 18000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 115Hz
• Mechanical quality factor QMS 3.79
• Electrical quality factor QES 1.33
• Total quality factor QTS 0.99

Large signal parameters

• Maximum linear excursion xmax 0.5mm
• Air volume displaced at xmax VD 1.4cm³
• Power handling P 8W
• Program power Pmax 24W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 7.2Ω
• Inductance (1kHz) LE 0.037mH
• VC Diameter 20mm

Magnet

• Force factor Bl 2.98N/A
• Motor constant Bl/√RE 1.11N/√W
• Weight 0.074kg

Diaphragm

• Effective diameter 60mm
• Effective area SD 28cm²
• Moving mass MMS 2.2g
• Moving mass (without air load) MMD 2.1g

Suspensions

• Stiffness KMS 1.15N/mm
• Compliance CMS 873µm/N
• Equivalent volume to the compliance VAS 1.04L
• Mechanical resistance RMS 0.42N·s/m

Dimensions

• Nominal diameter 3.2″
• 80mm
• Overall diameter 80mm
• Baffle cutout diameter 73mm
• Overall depth 47mm
• Volume occupied by the driver (estimated) 0.15L
• Net weight 0.261kg