Precision Devices PD.2155-1F

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.7dB
• Frequency response 30 - 300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 7.88
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.34

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 1.48mH
• VC Diameter 138.7mm
• Winding height HVC 32mm
• Winding material Copper (Inside / Outside Winding)
• Former material Glass Fibre

Magnet

• Flux density B 1.2T
• Force factor Bl 31.3N/A
• Motor constant Bl/√RE 13.9N/√W
• Air gap height HAG 12mm
• Diameter 280mm
• Material Ceramic

Diaphragm

• Effective diameter 440mm
• Effective area SD 1520cm²
• Moving mass MMS 304g
• Moving mass (without air load) MMD 261g
• Material Paper

Suspensions

• Stiffness KMS 15.3N/mm
• Compliance CMS 65.5µm/N
• Equivalent volume to the compliance VAS 266L
• Mechanical resistance RMS 8.48N·s/m
• Surround material Fabric
• Spider material Fabric

Dimensions

• Nominal diameter 21″
• 530mm
• Overall diameter 550mm
• Baffle cutout diameter 492mm
• Overall depth 219mm
• Flange thickness 14mm
• Mounting depth 205mm
• Volume occupied by the driver (estimated) 13L
• Net weight 26.5kg
• Frame material Vented Cast Aluminium