Precision Devices PD.156

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.1dB
• Frequency response 50 - 1500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 50.3Hz
• Mechanical quality factor QMS 7.45
• Electrical quality factor QES 0.50
• Total quality factor QTS 0.47

Large signal parameters

• Maximum linear excursion xmax 8.1mm
• Air volume displaced at xmax VD 735cm³
• Power handling P 650W
• Program power Pmax 1300W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.7Ω
• Inductance (1kHz) LE 1mH
• VC Diameter 115mm
• Winding height HVC 21mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.5T
• Force factor Bl 21N/A
• Motor constant Bl/√RE 8.8N/√W
• Air gap height HAG 9mm
• Material Ceramic

Diaphragm

• Effective diameter 340mm
• Effective area SD 908cm²
• Moving mass MMS 125g
• Moving mass (without air load) MMD 105g
• Material Paper

Suspensions

• Stiffness KMS 12.4N/mm
• Compliance CMS 80.8µm/N
• Equivalent volume to the compliance VAS 93.4L
• Mechanical resistance RMS 5.28N·s/m
• Surround material Fabric

Dimensions

• Nominal diameter 15″
• 380mm
• Overall diameter 410mm
• Baffle cutout diameter 357mm
• Overall depth 153mm
• Flange thickness 10mm
• Mounting depth 143mm
• Volume occupied by the driver (estimated) 5.5L
• Net weight 13.25kg