Tang Band W4-1749S

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.9dB
• Frequency response 60 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 60Hz
• Mechanical quality factor QMS 2.98
• Electrical quality factor QES 0.39
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 0.9mm
• Air volume displaced at xmax VD 5.1cm³
• Power handling P 25W
• Program power Pmax 50W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.8Ω
• Inductance (1kHz) LE 0.051mH
• VC Diameter 25.4mm

Magnet

• Force factor Bl 5.8N/A
• Motor constant Bl/√RE 2.22N/√W
• Air gap height HAG 6mm
• Material Ferrite

Diaphragm

• Effective diameter 85mm
• Effective area SD 57cm²
• Moving mass MMS 4.99g
• Moving mass (without air load) MMD 4.7g
• Material Polypropylene

Suspensions

• Stiffness KMS 0.727N/mm
• Compliance CMS 1376µm/N
• Equivalent volume to the compliance VAS 6.35L
• Mechanical resistance RMS 0.63N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.66L
• Net weight 1.633kg