Tang Band W4-937SF

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.5dB
• Frequency response 65 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 65Hz
• Mechanical quality factor QMS 1.22
• Electrical quality factor QES 0.33
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 4.5mm
• Air volume displaced at xmax VD 26cm³
• Power handling P 25W
• Program power Pmax 50W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.8Ω
• Inductance (1kHz) LE 0.49mH
• VC Diameter 32mm

Magnet

• Force factor Bl 6.68N/A
• Motor constant Bl/√RE 2.56N/√W
• Air gap height HAG 6mm
• Material Neodymium

Diaphragm

• Effective diameter 85mm
• Effective area SD 57cm²
• Moving mass MMS 4.92g
• Moving mass (without air load) MMD 4.6g
• Material Paper

Suspensions

• Stiffness KMS 0.951N/mm
• Compliance CMS 1052µm/N
• Equivalent volume to the compliance VAS 4.86L
• Mechanical resistance RMS 1.65N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.24L
• Net weight 0.626kg