Originally Posted by JALFK
It's cool to get your head around the routing of it, then you can do it when and with whatever you want! So simple, very powerful.
Yes. I have no problem doing it with M/S encoder & decoder. Because it does it for me and I don't have to think. I want to have a clear idea of what is going on at the core of it.
L+R = mid. First question. If you have a hi hat that's panned hard left in your mix, and you combine L+R to get the mid info, wouldn't you end up a hi hat in the mid signal? So anything you do to the mid would then raise up the level of a hi-hat in the mid signal wouldn't it?
L-R = side, any information shared by L and R (the mid info) would null out and only the side would remain. So you still end up with the hi hat in this signal as well.
So, to continue on to decoding. So, if you keep the side and mid signal both in the center, you get L+R+L-R, or 2L. Without worrying about pan laws, you could shoot that sum to the Left and subtract 6db to get the original Left signal on the Left speaker. Now we have the regular level of the hi hat on the left.
For the right, invert the side and you get R-L. Then add that to the mid signal. L+R+R-L. You get 2R. Pan that hard Right, subtract 6db, you get the original Right signal. But here's the rub. Let's say you gained up the mid signal. In that mid signal, you now have an increased level of hi hat. So when you decode back to the right, wouldn't you get a little bit of hi hat on the right channel?