EASTECH 04A18EHC18225F

• Sensitivity (1W, 1m, infinite baffle) SPL1W 80.5dB

Thiele & Small parameters

• Resonance frequency (free air) fS 172Hz
• Mechanical quality factor QMS 7.74
• Electrical quality factor QES 0.49
• Total quality factor QTS 0.46

Large signal parameters

• Maximum linear excursion xmax 2mm
• Air volume displaced at xmax VD 1.7cm³
• Power handling P 2W
• Program power Pmax 4W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz) LE 0.12mH
• VC Diameter 19.4mm
• Winding height HVC 7mm
• Winding material PESVW
• Former material Kapton

Magnet

• Force factor Bl 3.12N/A
• Motor constant Bl/√RE 1.71N/√W
• Air gap height HAG 3mm
• Material Neodymium

Diaphragm

• Effective diameter 33mm
• Effective area SD 8.6cm²
• Moving mass MMS 1.32g
• Moving mass (without air load) MMD 1.3g
• Material Paper

Suspensions

• Stiffness KMS 1.55N/mm
• Compliance CMS 647µm/N
• Equivalent volume to the compliance VAS 0.068L
• Mechanical resistance RMS 0.185N·s/m
• Surround material IIR

Dimensions

• Nominal diameter 1.75″
• 44mm
• Net weight 0.069kg
• Frame material Steel