Precision Devices PD.184

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.3dB
• Frequency response 40 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 33.4Hz
• Mechanical quality factor QMS 16.47
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.27

Large signal parameters

• Maximum linear excursion xmax 8mm
• Air volume displaced at xmax VD 931cm³
• Power handling P 600W
• Program power Pmax 1200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.4Ω
• Inductance (1kHz) LE 1.34mH
• VC Diameter 101mm
• Winding height HVC 22mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 0.97T
• Force factor Bl 24.2N/A
• Motor constant Bl/√RE 10.5N/√W
• Air gap height HAG 11mm
• Material Ceramic

Diaphragm

• Effective diameter 385mm
• Effective area SD 1164cm²
• Moving mass MMS 143g
• Moving mass (without air load) MMD 114g
• Material Paper

Suspensions

• Stiffness KMS 6.26N/mm
• Compliance CMS 160µm/N
• Equivalent volume to the compliance VAS 304L
• Mechanical resistance RMS 1.82N·s/m

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 474mm
• Baffle cutout diameter 415mm
• Overall depth 195mm
• Flange thickness 13mm
• Mounting depth 182mm
• Volume occupied by the driver (estimated) 7.3L
• Net weight 14.0kg