Experiment with the knobs and set them to your liking - that's the important thing, no?
Phase switches + and - of electricity - sounds a little different - set it to your liking.
Gain controls loudness - how much power goes to it.
I would just experiment with them - I find myself adjusting them time to time depending on the source.
Anonymous
Posted on
Phase control: To make your subwoofer in phase or out of phase with your main speakers, depending on your liking. (Make sure your main speakers are in phase though.)