Precision Devices PD.184NR1

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.5dB
• Frequency response 30 - 800Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 38Hz
• Mechanical quality factor QMS 6.17
• Electrical quality factor QES 0.29
• Total quality factor QTS 0.27

Large signal parameters

• Maximum linear excursion xmax 8.5mm
• Air volume displaced at xmax VD 989cm³
• Power handling P 1000W
• Program power Pmax 2000W
• Peak power Ppeak 4000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.4Ω
• Inductance (1kHz) LE 1.89mH
• VC Diameter 101.6mm
• Winding height HVC 22mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.18T
• Force factor Bl 29.5N/A
• Motor constant Bl/√RE 12.7N/√W
• Air gap height HAG 11mm
• Diameter 138mm
• Material Neodymium

Diaphragm

• Effective diameter 385mm
• Effective area SD 1164cm²
• Moving mass MMS 216g
• Moving mass (without air load) MMD 187g
• Material Paper

Suspensions

• Stiffness KMS 10N/mm
• Compliance CMS 99.7µm/N
• Equivalent volume to the compliance VAS 102L
• Mechanical resistance RMS 8.36N·s/m
• Surround material M Roll Poly Cotton
• Spider material Poly Cotton / silicone damping

Dimensions

• Nominal diameter 18″
• 457mm
• Overall diameter 474mm
• Baffle cutout diameter 415mm
• Overall depth 215mm
• Flange thickness 15mm
• Mounting depth 200mm
• Volume occupied by the driver (estimated) 6.1L
• Net weight 9.6kg
• Frame material Vented cast aluminium