PRV Audio 6MB250-NDY-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 91.8dB
• Frequency response 115 - 6500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 109Hz
• Mechanical quality factor QMS 8.61
• Electrical quality factor QES 0.62
• Total quality factor QTS 0.58

Large signal parameters

• Maximum linear excursion xmax 4.3mm
• Air volume displaced at xmax VD 66cm³
• Power handling P 125W
• Program power Pmax 250W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 4.0Ω
• Inductance (1kHz) LE 0.38mH
• VC Diameter 38.1mm
• Winding height HVC 11mm
• Winding material Copper Clad Aluminium
• Former material Kapton

Magnet

• Force factor Bl 8.03N/A
• Motor constant Bl/√RE 4.01N/√W
• Air gap height HAG 5mm
• Material Neodymium

Diaphragm

• Effective diameter 140mm
• Effective area SD 154cm²
• Moving mass MMS 14.6g
• Moving mass (without air load) MMD 13.3g

Suspensions

• Stiffness KMS 6.94N/mm
• Compliance CMS 144µm/N
• Equivalent volume to the compliance VAS 4.78L
• Mechanical resistance RMS 1.17N·s/m

Dimensions

• Nominal diameter 6″
• 167mm
• Overall diameter 167mm
• Baffle cutout diameter 143mm
• Overall depth 114mm
• Flange thickness 49mm
• Mounting depth 65mm
• Volume occupied by the driver (estimated) 0.33L
• Net weight 0.55kg
• Frame material Stamped Steel