DAB is touted as Digital Quality, but it is basically a lo-fi headache inducing bodge-up.

Wackypedia reports:
"DAB provides low audio quality in the UK due to 98% of stereo stations using a bit rate level of 128 kbit/s[20] with the MP2 audio codec, which provides far worse sound quality than FM-quality (assuming good reception on both DAB and FM). [21] Also, a large and growing number of music stations are transmitting in mono.[22] Indeed, the bit rates used by the radio stations on other digital platforms, such as cable, terrestrial and satellite are usually higher than on DAB, so the audio quality is also higher.[23] For example, all of the BBC stations use higher bit rates on the digital TV platforms than on DAB apart from the BBC World Service on Freeview."
Source: http://en.wikipedia.org/wiki/Digital_radio_in_the_United_Kingdom