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It works much better if you stick to green and a little bit of yellow. The rest of the headroom is for transient peaks, especially those too fast to measure on the meters. Then set your amp to the volume you want at max.
If you want the compressed sound you get from pushing the mixer into the red then put a compressor/limiter between the mixer and amp. I use one on my portable digital setup. You can compress the files but it's not quite the same as compressing the mixed output.
When you dj you tend to get an energy lift from a successful mix, and after that you feel an energy drop so you up the volume a bit. If you do that for an hour you end up with no headroom. That's what I mean by pushing the volume for emphasis.
There are a lot of dj's that can avoid this, one method is to reduce the volume a bit once the track settles in so you have somewhere to go again.
The first set they were doing a lot of peak to peak mixing, second set they're mixing in drops and generally allowing some lower energy sections. More of a warm up style.
I need to have a listen. Wonder what's @Airhead verdict on the audio?
Same night but different setup with CDJs instead of vinyl and maybe diff mixer