The Diamond Marimba has fourteen rows of rosewood
bars mounted on a terraced platform. Beginning with the
second row, each succeeding row rises a half inch above the
previous row, so that the difference in height between the
first and the last row equals 6½ in.Each bar is
equipped with a tuned acrylic tube resonator that amplifies
the frequency of the bar.
The marimba’s central section consists of a diamond-shaped
lattice that includes seven ascending and seven descending
diagonal rows of bars.Each row includes seven bars.Rows that ascend from left
to right sound major tonalities, and rows that descend from
left to right sound minor tonalities.
From my book Musical Mathematics: On the Art and Science
of Acoustic Instruments