gszfsm001 2PCS Bass Radiator Woofer Vibration Membrane Passive Speaker Subwoofer 70mm DIY Home Theater Repair Kit
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Bass radiator, also known as passive speaker, is used to replace the inverted tube, the subwoofer made with the radiator and the traditional back subwoofer.
Low frequency dive depth and backward , But the sense of speed is significantly faster than the back-type.
Tight box advantage, Get rid of inverted pipe mouth to bring the wind noise.