Precision Devices PD.1225C001

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.2dB
• Frequency response 45 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 39Hz
• Mechanical quality factor QMS 5.90
• Electrical quality factor QES 0.20
• Total quality factor QTS 0.19

Large signal parameters

• Maximum linear excursion xmax 5.6mm
• Air volume displaced at xmax VD 308cm³
• Power handling P 300W
• Program power Pmax 600W
• Peak power Ppeak 1200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.33mH
• VC Diameter 63.5mm
• Winding height HVC 15.8mm
• Winding material Copper Clad Aluminium
• Former material Glass Fibre

Magnet

• Flux density B 1.1T
• Force factor Bl 17.5N/A
• Motor constant Bl/√RE 7.69N/√W
• Air gap height HAG 9mm
• Diameter 200mm
• Material Y30 Ferrite

Diaphragm

• Effective diameter 265mm
• Effective area SD 550cm²
• Moving mass MMS 48.3g
• Moving mass (without air load) MMD 38.8g
• Material Paper

Suspensions

• Stiffness KMS 2.75N/mm
• Compliance CMS 363µm/N
• Equivalent volume to the compliance VAS 156L
• Mechanical resistance RMS 2.01N·s/m
• Surround material Fabric
• Spider material Poly Cotton

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 331mm
• Baffle cutout diameter 282mm
• Overall depth 123mm
• Flange thickness 10mm
• Mounting depth 113mm
• Volume occupied by the driver (estimated) 3.1L
• Net weight 8.45kg
• Frame material Vented cast aluminium