1.
Turn the tuning stick attached to the sixth or largest string to set the string down to the B note. Verify that the string is the correct pitch by comparing it with an electric guitar receiver or a reference pitch generator.
2.
Set the fifth string down to the F # note. Some electric guitar receivers may refer to this note as Gb.
3.
Set the fourth string down in the B note. This B note is one octave higher than the 6-string in Drop B tuning.
4.
Set the third string down to the E-note.
5.
Set the second string down to the G # note. Some electric guitar receivers may refer to this note as Ab.
6.
First step down to the Db note. Some electric guitar receivers may refer to this note as C #.
Tips and warnings
‘Drop B’ guitar tuning is mostly used by heavy metal guitarists who want a dark tone. This setting is common with dead-metal and doom-metal bands. Drop B tuning uses the same interval difference between each string as other dropped guitar tunings, such as ‘Drop D’ and ‘Drop C’ setting. Drop B tuning lowers the pitch of each string lower than the two settings to get a darker tone. The name refers to the B note the sixth string is set to.
Source:danspela.com