Precision Devices PD.158

• Sensitivity (1W, 1m, infinite baffle) SPL1W 100.3dB
• Frequency response 40 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 54.6Hz
• Mechanical quality factor QMS 14.91
• Electrical quality factor QES 0.25
• Total quality factor QTS 0.24

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 513cm³
• Power handling P 600W
• Program power Pmax 1200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.8Ω
• Inductance (1kHz) LE 0.76mH
• VC Diameter 101mm
• Winding height HVC 19mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.1T
• Force factor Bl 25.4N/A
• Motor constant Bl/√RE 10.6N/√W
• Air gap height HAG 11mm
• Material Ceramic

Diaphragm

• Effective diameter 330mm
• Effective area SD 855cm²
• Moving mass MMS 85.2g
• Moving mass (without air load) MMD 67g
• Material Paper

Suspensions

• Stiffness KMS 9.32N/mm
• Compliance CMS 107µm/N
• Equivalent volume to the compliance VAS 64.8L
• Mechanical resistance RMS 1.96N·s/m
• Surround material Fabric

Dimensions

• Nominal diameter 15″
• 380mm
• Overall diameter 410mm
• Baffle cutout diameter 357mm
• Overall depth 156mm
• Flange thickness 10mm
• Mounting depth 146mm
• Volume occupied by the driver (estimated) 5.5L
• Net weight 13.0kg