Precision Devices PD.1845-1N

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.6dB
• Frequency response 30 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 34.1Hz
• Mechanical quality factor QMS 10.96
• Electrical quality factor QES 0.33
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 16mm
• Air volume displaced at xmax VD 1853cm³
• Power handling P 1500W
• Program power Pmax 3000W
• Peak power Ppeak 6000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 4.7Ω
• Inductance (1kHz) LE 1.58mH
• VC Diameter 114.3mm
• Winding height HVC 37mm
• Winding material Copper Clad Aluminium
• Former material Glass Fibre

Magnet

• Flux density B 0.92T
• Force factor Bl 26.4N/A
• Motor constant Bl/√RE 12.2N/√W
• Air gap height HAG 15mm
• Diameter 150mm
• Material Neodymium

Diaphragm

• Effective diameter 384mm
• Effective area SD 1158cm²
• Moving mass MMS 231g
• Moving mass (without air load) MMD 203g
• Material Paper

Suspensions

• Stiffness KMS 10.6N/mm
• Compliance CMS 94µm/N
• Equivalent volume to the compliance VAS 179L
• Mechanical resistance RMS 4.52N·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 215mm
• Flange thickness 15mm
• Mounting depth 200mm
• Volume occupied by the driver (estimated) 6.6L
• Net weight 10.9kg
• Frame material Vented Cast Aluminium