Tang Band WT-644F

• Sensitivity (1W, 1m, infinite baffle) SPL1W 91.3dB
• Frequency response 32 - 600Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 32Hz
• Mechanical quality factor QMS 11.19
• Electrical quality factor QES 0.43
• Total quality factor QTS 0.42

Large signal parameters

• Maximum linear excursion xmax 9.3mm
• Air volume displaced at xmax VD 324cm³
• Power handling P 180W
• Program power Pmax 360W

Voice Coil

• Nominal impedance Z 2 x 8Ω
• DC resistance (in series) RE 12.8Ω
• Inductance (1kHz, in series) LE 6.68mH
• VC Diameter 50mm

Magnet

• Force factor (in series) Bl 29.1N/A
• Motor constant Bl/√RE 8.13N/√W
• Air gap height HAG 8mm
• Material Ferrite

Diaphragm

• Effective diameter 211mm
• Effective area SD 350cm²
• Moving mass MMS 69.9g
• Moving mass (without air load) MMD 65.2g
• Material Paper

Suspensions

• Stiffness KMS 2.92N/mm
• Compliance CMS 342µm/N
• Equivalent volume to the compliance VAS 59.5L
• Mechanical resistance RMS 1.26N·s/m
• Surround material Foam

Dimensions

• Nominal diameter 10″
• 254mm
• Volume occupied by the driver (estimated) 1.9L
• Net weight 4.5kg