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In this video, we are going to look at an overview of compression.Compressors
are very valuable as they allow us to reduce the dynamic range of a signal, which is the
difference between the loud and soft parts of a signal. By compressing different amplitudes
closer together we are able to create a more level mix. So let's take a look at the compressor.
There are several different control parameters available to us. The first thing we need to
look at is the power button, or more accurately the insert button.This is rather self explanatory.
Next you will see an input gain, where you can adjust the level at which the signal comes
into the compressor. As with any audio device you want to make sure you have good strong
signal for the compressor to function properly but not so strong that you clip. After
the gain stage is the threshold. The threshold tells the compressor at what decibel level
to start compressing. Anything lower than the set threshold remains unaffected, while
anything above is compressed. Next we can fine tune this threshold with the knee. The
softer the knee the more gradual the transition from compressed to uncompressed. The harder
the knee, the harsher the transition. Now that we have told the compressor what signals to
compress, we have to tell it how much to compress them. We do this with the compression ratio
which determines the amount. For example, a 2:1 ratio would reduce the part of the signal
that is over the threshold by half. The next two things to set are your attack and release
time. The attack time controls how long it takes for the signal to become fully compressed
after it passes the threshold. The release time is the exact opposite and controls how
long it takes for the signal to fully decompress after it drops below the threshold. After
you have adjusted all the compression settings, the signal's overall level will be somewhat
reduced. The output gain allows you to make up for the lost amplitude as a result of the
applied compression. Now that you have an overview of how to use a compressor, we can
take a look at specific scenarios where compression is important. Thanks for joining me today
and please check out our other church technology resources available at academyav.com