Construction
The sousaphone is a valved brass instrument with the same tube length and musical range as other tubas. The sousaphone's shape is such that the bell is above the tubist's head and projecting forward. The valves are situated directly in front of the musician slightly above the waist and most of the weight rests on one shoulder. The bell is normally detachable from the instrument body to facilitate transportation and storage. Excepting the instrument's general shape and appearance, the sousaphone is technically very similar to a standard (upright) tuba.
For simplicity and durability, modern sousaphones almost definitively use three non-compensating piston valves in their construction, in direct contrast to their concert counterparts' large variation in number, type, and orientation. It has been incorrectly noted that the tuba is a conical brass instrument and the sousaphone is a cylindrical brass instrument; actually both instruments are semi-conical—no valved brass instrument can be entirely conical, since the middle section with the valves must be cylindrical. While the degree of conicity of the bore does affect the timbre of the instrument much as in a cornet and trumpet, or a euphonium and a trombone, the bore profile of a sousaphone and most tubas is similar.
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“There’s no art
To find the mind’s construction in the face.”
—William Shakespeare (1564–1616)