ESX SX1240

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.1dB

Thiele & Small parameters

• Resonance frequency (free air) fS 28Hz
• Mechanical quality factor QMS 5.30
• Electrical quality factor QES 0.37
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 8.5mm
• Maximum excursion before damage xlim 16mm
• Air volume displaced at xmax VD 429cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz) LE 1.1mH
• VC Diameter 50mm
• Winding height HVC 25mm
• Former material Aluminium

Magnet

• Force factor Bl 14N/A
• Motor constant Bl/√RE 7.83N/√W
• Diameter 156mm
• Height 40mm
• Weight 2.835kg

Diaphragm

• Effective diameter 254mm
• Effective area SD 505cm²
• Moving mass MMS 142g
• Moving mass (without air load) MMD 134g
• Material Non-pressed Paper

Suspensions

• Stiffness KMS 4.46N/mm
• Compliance CMS 224µm/N
• Equivalent volume to the compliance VAS 81L
• Mechanical resistance RMS 4.71N·s/m
• Surround material Rubber
• Spider material Single Nomex

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 315mm
• Baffle cutout diameter 282mm
• Mounting depth 140mm
• Volume occupied by the driver (estimated) 3.7L
• Net weight 8.2kg
• Frame material Diecast Aluminium