Tang Band W4-1879

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.6dB
• Frequency response 55 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 55Hz
• Mechanical quality factor QMS 2.68
• Electrical quality factor QES 0.51
• Total quality factor QTS 0.43

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 29cm³
• Power handling P 25W
• Program power Pmax 50W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.3Ω
• Inductance (1kHz) LE 0.025mH
• VC Diameter 25.4mm

Magnet

• Force factor Bl 4.19N/A
• Motor constant Bl/√RE 1.67N/√W
• Air gap height HAG 15mm
• Material Neodymium

Diaphragm

• Effective diameter 85mm
• Effective area SD 57cm²
• Moving mass MMS 4g
• Moving mass (without air load) MMD 3.7g
• Material Paper

Suspensions

• Stiffness KMS 0.506N/mm
• Compliance CMS 1977µm/N
• Equivalent volume to the compliance VAS 9.12L
• Mechanical resistance RMS 0.52N·s/m
• Surround material Foam Rubber

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.72L
• Net weight 1.753kg