Precision Devices PD.1851/2

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.4dB
• Frequency response 35 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 37Hz
• Mechanical quality factor QMS 18.49
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 12mm
• Air volume displaced at xmax VD 1397cm³
• Power handling P 1000W
• Program power Pmax 2000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.04mH
• VC Diameter 127mm
• Winding height HVC 29mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.18T
• Force factor Bl 31.5N/A
• Motor constant Bl/√RE 13.8N/√W
• Air gap height HAG 12mm
• Material Ceramic

Diaphragm

• Effective diameter 385mm
• Effective area SD 1164cm²
• Moving mass MMS 219g
• Moving mass (without air load) MMD 190g
• Material Paper

Suspensions

• Stiffness KMS 11.9N/mm
• Compliance CMS 84.3µm/N
• Equivalent volume to the compliance VAS 160L
• Mechanical resistance RMS 2.76N·s/m

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 474mm
• Baffle cutout diameter 415mm
• Overall depth 193mm
• Flange thickness 15mm
• Mounting depth 178mm
• Volume occupied by the driver (estimated) 10L
• Net weight 24.8kg