Precision Devices PDN.18SB40

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.4dB
• Frequency response 40 - 3500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 37.3Hz
• Mechanical quality factor QMS 19.25
• Electrical quality factor QES 0.26
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 699cm³
• Power handling P 600W
• Program power Pmax 1200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.6Ω
• Inductance (1kHz) LE 1.36mH
• VC Diameter 101mm
• Winding height HVC 19mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.2T
• Force factor Bl 28.6N/A
• Motor constant Bl/√RE 12.1N/√W
• Air gap height HAG 11mm
• Material Neodymium

Diaphragm

• Effective diameter 385mm
• Effective area SD 1164cm²
• Moving mass MMS 164g
• Moving mass (without air load) MMD 135g
• Material Paper

Suspensions

• Stiffness KMS 9.01N/mm
• Compliance CMS 111µm/N
• Equivalent volume to the compliance VAS 211L
• Mechanical resistance RMS 2N·s/m
• Surround material Fabric

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 474mm
• Baffle cutout diameter 415mm
• Overall depth 185mm
• Flange thickness 13mm
• Mounting depth 172mm
• Volume occupied by the driver (estimated) 5.1L
• Net weight 8.5kg