Precision Devices PDN.2151

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.5dB
• Frequency response 30 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 31.4Hz
• Mechanical quality factor QMS 18.30
• Electrical quality factor QES 0.28
• Total quality factor QTS 0.28

Large signal parameters

• Maximum linear excursion xmax 10.5mm
• Air volume displaced at xmax VD 1783cm³
• Power handling P 1000W
• Program power Pmax 2000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.4Ω
• Inductance (1kHz) LE 1.9mH
• VC Diameter 152mm
• Winding height HVC 30mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.1T
• Force factor Bl 35.9N/A
• Motor constant Bl/√RE 15.5N/√W
• Air gap height HAG 15mm
• Material Neodymium

Diaphragm

• Effective diameter 465mm
• Effective area SD 1698cm²
• Moving mass MMS 343g
• Moving mass (without air load) MMD 294g
• Material Paper

Suspensions

• Stiffness KMS 13.4N/mm
• Compliance CMS 74.7µm/N
• Equivalent volume to the compliance VAS 303L
• Mechanical resistance RMS 3.7N·s/m
• Surround material Fabric

Dimensions

• Nominal diameter 21″
• 530mm
• Overall diameter 550mm
• Baffle cutout diameter 492mm
• Overall depth 218mm
• Flange thickness 14mm
• Mounting depth 204mm
• Volume occupied by the driver (estimated) 9.5L
• Net weight 16.3kg