PRV Audio 21SW4000-NDY-2

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.9dB
• Frequency response 35 - 1200Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 30.8Hz
• Mechanical quality factor QMS 12.33
• Electrical quality factor QES 0.28
• Total quality factor QTS 0.28

Large signal parameters

• Maximum linear excursion xmax 15mm
• Air volume displaced at xmax VD 2886cm³
• Power handling P 2000W
• Program power Pmax 4000W

Voice Coil

• Nominal impedance Z 2Ω
• DC resistance RE 1.8Ω
• Inductance (1kHz) LE 1.14mH
• VC Diameter 134.6mm
• Winding height HVC 39mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Force factor Bl 24.4N/A
• Motor constant Bl/√RE 18.2N/√W
• Air gap height HAG 18mm
• Material Neodymium

Diaphragm

• Effective diameter 495mm
• Effective area SD 1924cm²
• Moving mass MMS 485g
• Moving mass (without air load) MMD 430g

Suspensions

• Stiffness KMS 18.2N/mm
• Compliance CMS 55µm/N
• Equivalent volume to the compliance VAS 285L
• Mechanical resistance RMS 7.61N·s/m

Dimensions

• Nominal diameter 21″
• 547mm
• Overall diameter 547mm
• Baffle cutout diameter 508mm
• Overall depth 265mm
• Flange thickness 20mm
• Mounting depth 245mm
• Volume occupied by the driver (estimated) 9.6L
• Net weight 13.7kg
• Frame material Die Cast Aluminum