' Features Low-distortion motor system. High-excursion capability. Heavy-duty 6-hole cast frame. Specifications Size: 4". Membrane material:Kevlar-Paper. Surround material:Rubber. Basket material:Aluminum. Magnet material:Ferrite. Outside diameter (mm):99. Cutout diameter (mm):78. Depth (mm):52. Thiele Small Parameters Imp. (Zn/ohm):4. SPL (1W/1M):86.6 dB. Fs:89 Hz. Mms(g):2.9. Cms (mm/N):1.11. Sd (cm2):38. VAS: 2.29. QMS:3.47. QES:0.56. QTS: 0.48. '
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