Classification

This scale is the result of an air column/bell start ratio If we divide the diameter of the bell with that of the beginning of the air column we get a number between 1.5 and 3.5. We can classify all the didgeridoos in 4 large families. Each family groups the instruments with a similar character, simply based on the overall shape of the air column (conical/cylindrical) and on the diameter of the column (wide/narrow). The result is a simple and very reliable reading grid, making it easier to search and purchase on line.

The diameters are measured with a caliper, start of the air column after the mouthpîece. This ratio is very reliable for a didg having a air column with a 'smooth' internal work, in the case of a hollowed eucalyptus instrument it give an approach of the instrumental character.