Precision Devices PD.184C002

• Sensitivity (1W, 1m, infinite baffle) SPL1W 98.3dB
• Frequency response 30 - 500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 40Hz
• Mechanical quality factor QMS 5.67
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 9.7mm
• Air volume displaced at xmax VD 1117cm³
• Power handling P 900W
• Program power Pmax 1800W
• Peak power Ppeak 3600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.11mH
• VC Diameter 101.6mm
• Winding height HVC 26mm
• Winding material Copper Flat Wire
• Former material Glass Fibre

Magnet

• Flux density B 1.1T
• Force factor Bl 21N/A
• Motor constant Bl/√RE 9.21N/√W
• Air gap height HAG 13mm
• Diameter 220mm
• Material Ceramic

Diaphragm

• Effective diameter 383mm
• Effective area SD 1152cm²
• Moving mass MMS 112g
• Moving mass (without air load) MMD 83.5g
• Material Fibre loaded paper

Suspensions

• Stiffness KMS 7.09N/mm
• Compliance CMS 141µm/N
• Equivalent volume to the compliance VAS 268L
• Mechanical resistance RMS 4.96N·s/m
• Surround material Poly cotton
• Spider material Poly Cotton

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 474mm
• Baffle cutout diameter 415mm
• Overall depth 191mm
• Flange thickness 15mm
• Mounting depth 176mm
• Volume occupied by the driver (estimated) 7.7L
• Net weight 15.5kg
• Frame material Vented cast aluminium