Precision Devices PD.2155-1N

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.9dB
• Frequency response 30 - 300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 33Hz
• Mechanical quality factor QMS 9.80
• Electrical quality factor QES 0.37
• Total quality factor QTS 0.36

Large signal parameters

• Maximum linear excursion xmax 14mm
• Air volume displaced at xmax VD 2128cm³
• Power handling P 1500W
• Program power Pmax 3000W
• Peak power Ppeak 6000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.1Ω
• Inductance (1kHz) LE 2.4mH
• VC Diameter 138.7mm
• Winding height HVC 32mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.45T
• Force factor Bl 30N/A
• Motor constant Bl/√RE 13.3N/√W
• Air gap height HAG 12mm
• Diameter 184mm
• Material Neodymium

Diaphragm

• Effective diameter 440mm
• Effective area SD 1520cm²
• Moving mass MMS 320g
• Moving mass (without air load) MMD 277g
• Material Paper

Suspensions

• Stiffness KMS 13.6N/mm
• Compliance CMS 73.4µm/N
• Equivalent volume to the compliance VAS 241L
• Mechanical resistance RMS 6.77N·s/m
• Surround material Fabric
• Spider material Fabric

Dimensions

• Nominal diameter 21″
• 530mm
• Overall diameter 550mm
• Baffle cutout diameter 492mm
• Overall depth 225mm
• Flange thickness 14mm
• Mounting depth 211mm
• Volume occupied by the driver (estimated) 8.2L
• Net weight 12.5kg
• Frame material Vented Cast Aluminium