Original sentence: A small, but increasing number of music radio stations and stations that carry drama on DAB in the UK are being broadcast in mono when some believe that they should be in stereo, though the majority of UK digital radios have a single speaker.However, most of these reduced bit-rate stations are new entrants to UK radio broadcasting.These stations are, however, generally available in stereo on the digital TV platforms, where capacity constraints are not such a concern.Transmission on DAB is far more expensive than on FM, and measures taken by broadcasters to limit their costs have resulted in some broadcasters choosing to broadcast a lower bitrates to reduce their transmission costs, this delivers sound quality, that some believe, is inferior to traditional FM (see Criticisms of DAB in the UK)
Edited sentence: A large and increasing number of music radio stations and stations that carry drama on DAB in the UK are being broadcast in mono when they should be in stereo.These stations are virtually all available in stereo on the digital TV platforms, however, as well as being stereo on FM.Transmission on DAB is far more expensive than on FM, and measures taken by broadcasters to limit their costs have resulted in some DAB ensembles having to carry too many channels, forcing bit rates to be reduced to levels that deliver sound quality inferior to traditional FM (see Criticisms of DAB in the UK)