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How do algorithms that allegedly bring back the quality lost when compressing audio like Pioneers sound retriever work? Are they effective in increasing sound quality or is it a marketing gimmick?
 

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I'm inclined to think it's a gimmick, that it only adjusts the EQ. It can be turned on instantly, which indicates to me that it does not analyze the song beforehand. Whatever is lost in compression cannot be "found" again.

On my unit it makes the song more bass heavy/ louder, but the clarity does not improve.
 
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