Fostex P1000K

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.7dB
• Frequency response 82 - 16000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 82Hz
• Mechanical quality factor QMS 4.00
• Electrical quality factor QES 0.60
• Total quality factor QTS 0.53

Large signal parameters

• Maximum linear excursion xmax 0.4mm
• Air volume displaced at xmax VD 1.8cm³
• Power handling P 12W
• Program power Pmax 36W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.8Ω
• Inductance (1kHz) LE 0.04mH
• VC Diameter 20mm

Magnet

• Force factor Bl 4.29N/A
• Motor constant Bl/√RE 1.65N/√W
• Weight 0.12kg

Diaphragm

• Effective diameter 80mm
• Effective area SD 50cm²
• Moving mass MMS 3.1g
• Moving mass (without air load) MMD 2.8g

Suspensions

• Stiffness KMS 0.806N/mm
• Compliance CMS 1241µm/N
• Equivalent volume to the compliance VAS 4.84L
• Mechanical resistance RMS 0.4N·s/m

Dimensions

• Nominal diameter 4″
• 100mm
• Overall diameter 107mm
• Baffle cutout diameter 94mm
• Overall depth 48mm
• Volume occupied by the driver (estimated) 0.12L
• Net weight 0.405kg