The D650 has 4½ octaves of range; the lowest note is the A two octaves below middle C. It is configured in a 19/18 configuration, meaning there are 19 courses of strings on the treble bridge and 18 courses on the bass bridge. A super-bass bridge on the left provides the lower octave.
The overall range is A1 to E6; the chromatic range is B2 to E6.
Superscript numbers indicate octaves (C4 is Middle C).
Dots indicate marked courses.
All strings have loop ends.
Wire gauges are shown in inches.
PB = phosphor bronze wire.
PBW = phosphor bronze wound.
SSW = stainless steel wound.
Unspecified strings are plain steel wire.
Downloadable string/tuning chart
Downloadable string order form