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In page Loudspeaker:
"Digital speakers have been the subject of experiments performed by Bell Labs as far back as the 1920s.[1] The design is simple; each bit controls a driver, which is either fully on or off. Practical problems with this design have led manufacturers to abandon it. For a reasonable number of bits (required for adequate sound reproduction quality), the physical size of a speaker system becomes very large.[a] Compromises in implementation of an effective reconstruction filter make aliasing a significant issue.[citation needed]
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