Good in-ear headphones have always been able to deliver decent levels of bass thanks to their proximity to your ear and tight seal. But the majority of pairs still lack real driving power, which is something you can only really get from a pair of on- or over-ears.

Denon is hoping its latest pair of in-ear headphones, the AH-C821, can buck that trend and conjure similar levels of power thanks to a new design approach that places two drivers in each earpiece, one in front of the other.

Is this a method of madness or has Denon struck a real turning point for affordable in-ear headphones?
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https://www.pocket-lint.com/headphones/reviews/denon/140006-denon-ah-c821-review-big-sound-in-a-small-package