Bluetooth audio is convenient, but if there’s a mismatch between the codecs your phone and your headphones support, you won’t hear your music’s full quality. Questyle’s tiny dongle fixes that by adding leading high-quality codecs to any phone –or, for that matter, PC

FiiO promises 'a brand new kind of listening experience' for your high-end headphones and IEMs with its new K13 R2R headphone amp/DAC.

The Campfire Audio Relay is a solid and compact headphone amp/DAC but needs a performance taste-test before you buy it.