Mad_Cyril
I don’t think there is a particular advantage to it. I think it can be a bit counterintuitive, because on the face of it, hearing both channels makes sense because you are listening to what you hope will happen when you start the transition. In reality, you are really not hearing the depth that you need because its obscured by the other things that are going on.
The comparison that comes to mind is that if you were talking on your phone using the speaker, that would be fine if you were in a quiet room but if the room got noisy, you would probably want to put it to your ear so you don’t miss what is being said, particularly if you were interested in subtle things the person was trying to convey with the tone or inflection of their voice etc.
I would definitely echo what Amps said about damaging your hearing. If you are hearing approximately 50% by splitting the cue, the temptation is to crank it up by the same order to drone out what you are hearing on the monitor. Do that in a club regularly and it will take a toll on your ears. Although doing it at home won’t be as damaging, it will still be harmful to your ears.
