When it comes to dynamics, panning and equalization play a part of this as well.
Panning is the ability to move the signal from one channel to another. In its simplest form it is placing signal in the left, right, and center channels at various proportions. In a more technical and concise definition, it’s the sending of a signal to multiple channels in variable amounts.
If you are mixing in a true stereo environment (or if you are mixing stereo for recording), you will find that panning sources around will create a broader-sounding mix. There are many theories on this, but the principle is that by panning sources you can help bring certain instruments more predominately into the mix as well ...