Turn off all bass eq, bass boost, loudness settings on head unit and amp. Get up to 80 to 90% head unit volume, go up relatively high on the sub level, give yourself like 6 levels of headroom so you can adjust it on weaker bass music. Go to the amp lower it all down, play your hardest hitting song, raise the gain till it stops getting louder, then back it off a hair. Then do 2 to 5 min test sessions to see if any of the equipment gets hot or smells. If it doesnt smell and only gets warm, you are good. If it does smell, keep backing the gain or sub level down.