Why JBL A130 make this sound during low frequency (< 50hz) only with 100w AMP (I'm swapping the freq generator to show you the sound here)? is it its limitation? this artifact
JBL A130 Speaker Pair Book Shelf Speaker Javier STAGE Series Sound | eBay
JBL's pint-size Stage A130 speakers make a big impression - CNET
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JBL Stage A130 | Home Audio Loudspeaker System
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JBL Stage A130-BLK Black Bookshelf Loudspeakers (Pair)-JBLA130BLKAM | Crenshaws TV and Appliance | Seneca, Pendleton, Clemson, Anderson, and Utica, SC