The human ear can detect sounds between 20Hz and 20,OOOHz, which suggests Sony might have wasted its time develaping a pair of headphones that can plummet down to a depth of 5Hz. But while you can't hear this subterranean rumble, those deep vibrations actually make for a fuller overall tone. Sony has also spent time crafting some supersized 30mm Extra Bass diaphragm driver units and a direct vibe structure, which provides a high level of sound isolation, harnessing the headphones' tectonic plate-trembling depth_ And if 5Hz just isn't low enough, the XB-700s will dip dO'hn to a record low of just 3Hz.


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