You could, but I wouldn't.
You won't notice a difference unless you have one hell of a pa, and if you have said pa, you most likely have a decent console which won't be cold and digital.
Buy a graphic eq with some transformers. Klark 360s, bss 960s (I think that's the model) are fantastic choices.
A great stereo compressor with transformers would be a better option as well. There are too many of those to list. Don't use a strapped pair of DBX 160s though, they are absolutely horrible for 2 bus compression duties...
There are more "engineers" than people listening to music...