It is all to do with the bandwidth that they are given. The greater the bandwith the greater the sound.
My usefull posts How To Calibrate Your TV
I run a Digi out from my DAB into a stand alone 24bit DAC and Radio 1,2,3,4 sound great well.... very nearly a hifi sound but some other station like Planet rock sounded terrible through the DAC.
and porky is the man, he is so rude....it's funny!
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