Tang Band W4-992SD

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.1dB
• Frequency response 55 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 55Hz
• Mechanical quality factor QMS 2.93
• Electrical quality factor QES 0.40
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 3.5mm
• Air volume displaced at xmax VD 20cm³
• Power handling P 28W
• Program power Pmax 56W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 7.0Ω
• Inductance (1kHz) LE 0.87mH
• VC Diameter 25mm

Magnet

• Force factor Bl 6.43N/A
• Motor constant Bl/√RE 2.43N/√W
• Air gap height HAG 6mm
• Material Ferrite

Diaphragm

• Effective diameter 85mm
• Effective area SD 57cm²
• Moving mass MMS 7g
• Moving mass (without air load) MMD 6.7g
• Material Paper

Suspensions

• Stiffness KMS 0.807N/mm
• Compliance CMS 1239µm/N
• Equivalent volume to the compliance VAS 5.72L
• Mechanical resistance RMS 0.83N·s/m
• Surround material Rubber W-Shape

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.57L
• Net weight 1.413kg