Precision Devices PD.185C003

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.7dB
• Frequency response 30 - 500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 33Hz
• Mechanical quality factor QMS 10.60
• Electrical quality factor QES 0.23
• Total quality factor QTS 0.24

Large signal parameters

• Maximum linear excursion xmax 11mm
• Air volume displaced at xmax VD 1280cm³
• Power handling P 1500W
• Program power Pmax 3000W
• Peak power Ppeak 6000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.4Ω
• Inductance (1kHz) LE 2.8mH
• VC Diameter 127mm
• Winding height HVC 28mm
• Winding material Copper (Inside / outside winding)
• Former material Glass Fibre

Magnet

• Flux density B 1.25T
• Force factor Bl 31.5N/A
• Motor constant Bl/√RE 13.6N/√W
• Air gap height HAG 12mm
• Diameter 280mm
• Material Y35 Ferrite

Diaphragm

• Effective diameter 385mm
• Effective area SD 1164cm²
• Moving mass MMS 197g
• Moving mass (without air load) MMD 168g
• Material Paper

Suspensions

• Stiffness KMS 8.48N/mm
• Compliance CMS 118µm/N
• Equivalent volume to the compliance VAS 224L
• Mechanical resistance RMS 3.85N·s/m
• Surround material M Roll Poly Cotton
• Spider material Poly Cotton

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 474mm
• Baffle cutout diameter 415mm
• Overall depth 209mm
• Flange thickness 15mm
• Mounting depth 194mm
• Volume occupied by the driver (estimated) 10L
• Net weight 22.5kg
• Frame material Vented cast aluminium