PHL audio 4071NdU-19

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.2dB
• Frequency response 50 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 46Hz
• Mechanical quality factor QMS 4.99
• Electrical quality factor QES 0.18
• Total quality factor QTS 0.18

Large signal parameters

• Maximum linear excursion xmax 6.5mm
• Maximum excursion before damage xlim 16mm
• Air volume displaced at xmax VD 320cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 1.29mH
• VC Diameter 77mm
• Winding height HVC 17.5mm

Magnet

• Force factor Bl 23.3N/A
• Motor constant Bl/√RE 10.4N/√W
• Air gap height HAG 10mm
• Diameter 140mm
• Material Neodymium

Diaphragm

• Effective diameter 251mm
• Effective area SD 493cm²
• Moving mass MMS 69g
• Moving mass (without air load) MMD 61.1g

Suspensions

• Stiffness KMS 5.88N/mm
• Compliance CMS 170µm/N
• Equivalent volume to the compliance VAS 59.7L
• Mechanical resistance RMS 4N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 307mm
• Baffle cutout diameter 282mm
• Overall depth 155mm
• Flange thickness 13mm
• Mounting depth 142mm
• Volume occupied by the driver 2.1L
• Net weight 6.5kg