Have iFi raised the performance ceiling for portable Bluetooth DAC/Amps with the iDSD Valkyrie, or does the hefty "dongle" fall flat on its promises?

I went to the center of Ireland to get to the heart of how Sennheiser builds audiophile headphones and its legacy.

The best tech products announced this week include Bang & Olufsen's portable speaker and Leica's special-edition camera.