Dual-Driver Earbuds That Won?t Break the Bank

There’s a reason most cheap in-ear headphones sound that way: They only use one driver in each ear, which limits the audio range. If you want more life, more spaciousness and more oomph out of your favorite
tracks, upgrade to some dual-driver earbuds.
On these models, each earpiece contains two separate speakers— one to handle the high [...]

Source: http://www.wired.com/reviews/2011/04/pr_earbuds/

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