The tubax is a modified saxophone developed in 1999 by the German instrument maker Benedikt Eppelsheim. It exists in both E♭ contrabass and B♭ or C subcontrabass sizes. Its name is a portmanteau of the words "tuba" and "sax". The first size of tubax to be developed was the E♭ contrabass. It has the same register as a regular contrabass saxophone but is much more compact due to its tubing being folded more times. While the timbre of the E♭ tubax is more focused and compact than that of the full-sized contrabass saxophone, it still blends well with other sizes of saxophones and can be played with surprising agility compared to its size. The subcontrabass tubax uses a baritone saxophone or bass saxophone mouthpiece. While several B♭ subcontrabasses are already in use, only one C model has been manufactured. It was sold to Thomas Mejer of Switzerland in July 2002; he has recorded on it with Peter A. Schmid as the "Two Tubax Duo."^{[citation needed]}

 Lastly, the tubax's sound is a little bit "honkier" than the average saxophone.