[quote name='Astronomer' post='187650' date='Apr 28 2008, 10:23 PM']I'm physically cringing as I type this. Could someone please tell me what compression does? I've heard and read a lot of talk about using compression to get a particular sound, but when I try to use it the only thing that happens is that things get loud enough to make small children cry. In Norway.
So, what's it about? Is it just a means of preventing damage to the input stage of an amplifier, or to a speaker, or does it actually change the sound?
Sorry, I know it's a really dumb question, but it's bugging me and I can't understand much of the stuff on the net.
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There's no reason to cringe. We're all born knowing nothing (probably. Maybe. Depending on who you ask) and we all have to ask questions to learn stuff. If anyone gives you gyp then they're are a big meanie.
What everyone else says. You set the threshold and the ratio on most compressors. Any sound louder than the threshold is squeezed quieter according to the ratio you've chosen. Means that super-loud sounds don't stand out so much, and you can raise the volume of the quiet bits.
Lots of contention exists about the amount you should use it, but most of the controversy surrounds using it on a whole song at the mastering stage - if you make the loudest bits and the quietest bits the same volume and superloudify everything, where are the dynamics etc etc?.
Bit of compression on the bass can work a treat.