How Do I Adjust A Subwoofer For Best Sound?

1MeanA said
IMHO you got 40 watts to some entry level speakers. You can’t expect much. Your stereo should sound good with without the subs.

I have the same head unit in the Valiant and it sounds really good. It's also insulated with Killmat. The truck is a truck. Old and loud. As for the speakers, they are all I can afford. Feel free to send me a better pair.