ESX VX21PRO

• Sensitivity (1W, 1m, infinite baffle) SPL1W 91dB

Thiele & Small parameters

• Resonance frequency (free air) fS 27.4Hz
• Mechanical quality factor QMS 6.51
• Electrical quality factor QES 0.64
• Total quality factor QTS 0.58

Large signal parameters

• Maximum linear excursion xmax 23mm
• Maximum excursion before damage xlim 35mm
• Air volume displaced at xmax VD 3823cm³
• Power handling P 6000W
• Program power Pmax 12000W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.6Ω
• Inductance (1kHz, in series) LE 1.45mH
• VC Diameter 100mm
• Winding height HVC 80mm
• Former material BASV

Magnet

• Force factor (in series) Bl 21.6N/A
• Motor constant Bl/√RE 11.4N/√W
• Diameter 250mm
• Height 100mm
• Weight 17.01kg

Diaphragm

• Effective diameter 460mm
• Effective area SD 1662cm²
• Moving mass MMS 487g
• Moving mass (without air load) MMD 439g
• Material Glass-Fibre/Paper

Suspensions

• Stiffness KMS 14.7N/mm
• Compliance CMS 68µm/N
• Equivalent volume to the compliance VAS 266L
• Mechanical resistance RMS 12.9N·s/m
• Surround material High-Roll-Foam
• Spider material 6 layer Nomex

Dimensions

• Nominal diameter 21″
• 530mm
• Overall diameter 545mm
• Baffle cutout diameter 495mm
• Mounting depth 335mm
• Volume occupied by the driver (estimated) 25L
• Net weight 50.4kg
• Frame material Diecast Aluminium