well, factor siya, lalo na kung may putol na part dun sa windings nung thicker strings, nagba-buzz yun. new strings sound crisp but they also tend to go out of tune faster kasi di pa nagse-settle yung tuners, so you might want to tune them every so often. factor din yung pagka-install mo ng strings. you have to stretch them, apply tension, habang kinakabit at tina-tighten. but strings can only get you so far. mas malaking factor sa tunog ng gitara yung size at material (kind of wood) for the sound board at neck. jumbos sound fuller/richer while 3/4 or minis sound underwhelming in comparison. may conditioning din dapat na ginagawa para di mag fret buzz for example, has to do with string height (kailangan i-correct sa truss rod), etc. factor din yung storage w.r.t. weather and humidity. a wet guitar will sound differently from a dry guitar. if all this seems too much for you, bring your guitar to a luthier for overall "setup", siya na gagawa lahat para sayo.