Precision Devices PDN.8BM31

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.9dB
• Frequency response 70 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 79.3Hz
• Mechanical quality factor QMS 6.79
• Electrical quality factor QES 0.45
• Total quality factor QTS 0.42

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 91cm³
• Power handling P 150W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 0.34mH
• VC Diameter 51mm
• Winding height HVC 11.5mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.43T
• Force factor Bl 13.6N/A
• Motor constant Bl/√RE 5.81N/√W
• Air gap height HAG 6.5mm
• Material Neodymium

Diaphragm

• Effective diameter 170mm
• Effective area SD 227cm²
• Moving mass MMS 22g
• Moving mass (without air load) MMD 19.6g
• Material Paper

Suspensions

• Stiffness KMS 5.46N/mm
• Compliance CMS 183µm/N
• Equivalent volume to the compliance VAS 13.3L
• Mechanical resistance RMS 1.62N·s/m

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 210mm
• Baffle cutout diameter 191mm
• Overall depth 97mm
• Flange thickness 9mm
• Mounting depth 89mm
• Volume occupied by the driver (estimated) 0.84L
• Net weight 2.2kg