Peerless SDF-300F75PR03-04

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.9dB
• Frequency response 40 - 400Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 27Hz
• Mechanical quality factor QMS 9.71
• Electrical quality factor QES 0.37
• Total quality factor QTS 0.36

Large signal parameters

• Maximum linear excursion xmax 25.2mm
• Air volume displaced at xmax VD 1237cm³
• Power handling P 200W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 2.9Ω
• Inductance (1kHz) LE 1.14mH
• VC Diameter 75.6mm

Magnet

• Force factor Bl 18.7N/A
• Motor constant Bl/√RE 11N/√W
• Air gap height HAG 10mm
• Material Ferrite

Diaphragm

• Effective diameter 250mm
• Effective area SD 491cm²
• Moving mass MMS 255g
• Moving mass (without air load) MMD 247g
• Material Paper

Suspensions

• Stiffness KMS 7.69N/mm
• Compliance CMS 130µm/N
• Equivalent volume to the compliance VAS 45.5L
• Mechanical resistance RMS 4.46N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 12″
• 305mm
• Volume occupied by the driver (estimated) 7.6L
• Net weight 16.3kg
• Frame material Cast Aluminium