Tang Band W4-1320SI

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89dB
• Frequency response 75 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 75Hz
• Mechanical quality factor QMS 1.75
• Electrical quality factor QES 0.48
• Total quality factor QTS 0.38

Large signal parameters

• Maximum linear excursion xmax 3mm
• Air volume displaced at xmax VD 17cm³
• Power handling P 25W
• Program power Pmax 50W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.8Ω
• Inductance (1kHz) LE 0.014mH
• VC Diameter 25.4mm

Magnet

• Force factor Bl 5.13N/A
• Motor constant Bl/√RE 1.97N/√W
• Air gap height HAG 10mm
• Material Neodymium

Diaphragm

• Effective diameter 85mm
• Effective area SD 57cm²
• Moving mass MMS 3.99g
• Moving mass (without air load) MMD 3.7g
• Material Paper

Suspensions

• Stiffness KMS 0.882N/mm
• Compliance CMS 1134µm/N
• Equivalent volume to the compliance VAS 5.23L
• Mechanical resistance RMS 1.07N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.25L
• Net weight 0.64kg