Tang Band W4-1320SJ

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.5dB
• Frequency response 75 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 75Hz
• Mechanical quality factor QMS 1.29
• Electrical quality factor QES 0.49
• Total quality factor QTS 0.35

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 0.013mH
• VC Diameter 25.4mm

Magnet

• Force factor Bl 4.7N/A
• Motor constant Bl/√RE 1.8N/√W
• Air gap height HAG 10mm
• Material Neodymium

Diaphragm

• Effective diameter 85mm
• Effective area SD 57cm²
• Moving mass MMS 3.49g
• Moving mass (without air load) MMD 3.2g
• Material Paper

Suspensions

• Stiffness KMS 0.719N/mm
• Compliance CMS 1391µm/N
• Equivalent volume to the compliance VAS 6.41L
• Mechanical resistance RMS 1.27N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.28L
• Net weight 0.713kg