Like all other headphones, the Pi8 from Bowers & Wilkins connect to your iPhone, iPad or Mac via Bluetooth, but they have a trick up their sleeve: As Apple only supports AAC on its devices and is opposed to newer codecs such as AptX and its variants, the case can not only charge the headphones, but also acts as an AptX transmitter. Compared to their predecessors, the Pi7, the Pi8 are rounder and therefore...