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What is Expansion Ratio?

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asked Apr 14, 2015 in Audio Terms by AlexTinsley (912,010 points)
What is the term Expansion Ratio?

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answered Apr 14, 2015 by AlexTinsley (912,010 points)
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The expansion ratio sets the amount of noise reduction applied to a signal once the signal has dropped below the expansion threshold. For example, a 2:1 expansion ratio attenuates a signal 2dB for every 1dB it drops below the threshold. Ratio’s 4:1 and higher act much like a noise gate without the ability to tailor the attack, hold and release times.