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Old 10th May 2006
Lives for gear

Every electronic circuit brings it's own noise to the party. So if you add a compressor to the loop - maybe via D/A and A/D - you could be adding a layer of noise before you even begin.

Certainly the 'compression' part of a compressor doesn't raise the noise floor - it would actually duck the incoming noise.

But most compressors offer make up gain, and most people apply make up gain after compression. That's what raises the noise floor, as well as the noise produced by the compressor itself.