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The digital audio feeds from each radio station are multiplexed into one digital transmission, to be decoded by the receiver. While each station can use a different bitrate, and either monophonic or stereophonic (one or two channels of audio), all stations will have exactly the same coverage area. Each ensemble can only have a certain maximum total bitrate, a sort of "bit budget" that participating broadcasters must work within. Increasing the number of stations on an ensemble requires lower quality audio, whilst increasing audio quality requires removing audio channels.
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