The K11 R2R has three digital inputs on its back panel: USB-C, TOSLINK and coaxial. I connected it to a MacBook Pro via USB ...

This week, we've been looking at the FiiO K11 R2R DAC and headphone amplifier -- a proper hi-fi bargain if ever I've used one. Here are five more thoughts on it. 1. The digital pre-amplifier inside ...