Ну вот же
Play your guitar a while like this, and notice how much more ring, richness, and sustain you get out of it. The strings should now vibrate for close to the full potential of the instrument (which, of course, also depends upon factors such as nut and bridge type and condition, body style, neck and body woods, and so forth). Put simply, your tone is likely to sound bigger and fuller, and to bloom with a broader voice and a longer note decay than previously. If this as-high-as-you-can-hack-it setting is a little too much for every-day playing, try backing the strings down a hair at a time, and hopefully you can find a height that offers a healthy compromise. Sure, it’s also possible you preferred it the way it was before you adjusted it at all, and if your playing style involves a lot of speed riffing, hammer-ons and pull-offs, or extreme bending, you might simply require that as-low-as-it-goes actions (and will very likely mask its drawbacks with some judicious high-gain tone). With any luck, though, you’ll have discovered an easy means of achieving a fatter tone, without purchasing or modifying a single thing.
Есть хорошие книги по настройке гитары, правда у меня все на английском.