Peavey humbucker model - Manual (Page 20)

20
String action refers to the distance between the strings
and the frets on a stringed instrument. Peavey technicians
carefully set optimal string action on every guitar before it
leaves our factory; however, changes in temperature and
moisture (humidity), changing string gauges, making neck
adjustments or tuning can alter string action enough to
require a height adjustment to restore your guitar to factory
specifications. Undesirable low action causes buzzing, while
abnormally high action makes your guitar difficult to play.
String Action