The BBC set up frequencies on other satellites, but the channel's reach fell dramatically.

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In March Mario Monti's government announced it would sell a set of digital terrestrial television frequencies for as much money as it could raise.

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It tailors audio according to a set of headphones' acoustic quirks, smoothing out harsh frequencies that one model might accentuate, boosting weak bass for another.

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Many viewers will have to retune digital TVs or set-top boxes as some channels have moved to new frequencies.

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