Following are the four "Master Quality" (MQ) categories of high-resolution audio, which were formalized by the major record labels in 2014. See high-resolution audio, PCM, analog, CD and DSD.

It delivers an impressive specification for an RRP of £399. If you've been hankering after a hi-res audio player but don't want to pay a premium price tag, Astell & Kern's new Activo brand could ...