PHL audio 4021

• Sensitivity (1W, 1m, infinite baffle) SPL1W 90.7dB
• Frequency response 30 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 10.76
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 7.5mm
• Maximum excursion before damage xlim 14mm
• Air volume displaced at xmax VD 404cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.6Ω
• Inductance (1kHz) LE 1.28mH
• VC Diameter 77mm
• Winding height HVC 20mm

Magnet

• Force factor Bl 20.5N/A
• Motor constant Bl/√RE 8.66N/√W
• Air gap height HAG 10mm
• Diameter 204mm
• Material Ferrite

Diaphragm

• Effective diameter 262mm
• Effective area SD 539cm²
• Moving mass MMS 123g
• Moving mass (without air load) MMD 114g

Suspensions

• Stiffness KMS 5.88N/mm
• Compliance CMS 170µm/N
• Equivalent volume to the compliance VAS 70L
• Mechanical resistance RMS 2.51N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 307mm
• Baffle cutout diameter 282mm
• Overall depth 142mm
• Flange thickness 13mm
• Mounting depth 129mm
• Volume occupied by the driver 2.7L
• Net weight 8.9kg