Precision Devices PD.1845-2N

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.9dB
• Frequency response 30 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 13.50
• Electrical quality factor QES 0.40
• Total quality factor QTS 0.39

Large signal parameters

• Maximum linear excursion xmax 18mm
• Air volume displaced at xmax VD 2077cm³
• Power handling P 1800W
• Program power Pmax 3600W
• Peak power Ppeak 7200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 3.1mH
• VC Diameter 114.3mm
• Winding height HVC 42mm
• Winding material Copper Clad Aluminium
• Former material Glass Fibre

Magnet

• Flux density B 0.85T
• Force factor Bl 27N/A
• Motor constant Bl/√RE 11.8N/√W
• Air gap height HAG 15mm
• Diameter 150mm
• Material Neodymium

Diaphragm

• Effective diameter 383mm
• Effective area SD 1154cm²
• Moving mass MMS 250g
• Moving mass (without air load) MMD 222g
• Material Paper

Suspensions

• Stiffness KMS 12N/mm
• Compliance CMS 83µm/N
• Equivalent volume to the compliance VAS 157L
• Mechanical resistance RMS 4.07N·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