Good settings for a sub and amp?

Here’s what you do: Turn your vehicle on (make sure you have proper ventilation; carbon monoxide poisoning, from what I’ve heard, is not fun.) Next, put in some earplugs (if you think/know your system can hurt your ears, go ahead and put in some earplugs just to be safe.) Turn all your settings down (on your head-unit and amp(s) if you have them.) Proceed to turn your volume all the way up. Next, set your gain to what the head-unit or hi/lo converter sends out*. The next step is to start setting the filters, settings, etc. on your amp(s) if you have any on your system. The next step is to start setting your head-unit. Set the bass, mid, treble, and any other filters available on your head-unit. You can use the subwoofer setting to apply more/less bass to your taste when listening to certain types of music. Some systems even let you choose what size speakers are being used. *The gain for the amp(s) should be the pre-amp output voltage listed in your head-units manual (follow this number and match it exactly to your amp or you’ll risk damaging your system and your sound quality.)