Tang Band W4-1320SMF

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.8dB
• Frequency response 70 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 70Hz
• Mechanical quality factor QMS 2.26
• Electrical quality factor QES 0.43
• Total quality factor QTS 0.36

Large signal parameters

• Maximum linear excursion xmax 2.4mm
• Air volume displaced at xmax VD 14cm³
• Power handling P 25W
• Program power Pmax 50W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.4Ω
• Inductance (1kHz) LE 0.009mH
• VC Diameter 25.4mm

Magnet

• Force factor Bl 3.54N/A
• Motor constant Bl/√RE 1.92N/√W
• Air gap height HAG 10mm
• Material Ferrite

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 0.623N/mm
• Compliance CMS 1605µm/N
• Equivalent volume to the compliance VAS 7.4L
• Mechanical resistance RMS 0.78N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.74L
• Net weight 1.82kg