ESX SX840

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86dB

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 4.90
• Electrical quality factor QES 0.41
• Total quality factor QTS 0.38

Large signal parameters

• Maximum linear excursion xmax 3.5mm
• Maximum excursion before damage xlim 13mm
• Air volume displaced at xmax VD 75cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz) LE 1.1mH
• VC Diameter 50mm
• Winding height HVC 15mm
• Former material Aluminium

Magnet

• Force factor Bl 9.5N/A
• Motor constant Bl/√RE 5.31N/√W
• Diameter 110mm
• Height 40mm
• Weight 1.361kg

Diaphragm

• Effective diameter 165mm
• Effective area SD 214cm²
• Moving mass MMS 53g
• Moving mass (without air load) MMD 50.6g
• Material Non-pressed Paper

Suspensions

• Stiffness KMS 2.6N/mm
• Compliance CMS 385µm/N
• Equivalent volume to the compliance VAS 25L
• Mechanical resistance RMS 2.38N·s/m
• Surround material Rubber
• Spider material Single Nomex

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 218mm
• Baffle cutout diameter 189mm
• Mounting depth 114mm
• Volume occupied by the driver (estimated) 2.1L
• Net weight 4.9kg
• Frame material Diecast Aluminium