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Xdr (extended dynamic range, also known as sdr (super dynamic range)) is a quality-control and duplication process for the mass-production of pre-recorded audio cassettes. it is a process designed to provide higher quality audio on pre-recorded cassettes by checking the sound quality at all stages of the tape duplication process. in this way, the dynamic range of audio recorded on an xdr-duplicated cassette can be up to 13 decibels greater.