How do you change the action on a bass? I just got a used pretty cheap bass and I want the strings looser but I'm not sure how to change the action
get a hex key (different bridges will require different sizes), and on the bridge saddles, insert the key into the holes (2 on each saddle), and its just a matter of tightening/loosening.
I don't think you can loosen the string, without having it out of tune.
Lighter gauge strings will do a better job of giving you looser strings...in fact, I don't believe action will do anything for the string tension at all. They'll still be the same length from bridge to nut so they'll be the same tension.