At the far bottom end of the recorder family are two monstrous recorders pitched an octave below the Great Bass and Contrabass respectively. There is no set universal name for these two rare beasts. The instrument in C an octave below the Great Bass is sometimes called a Sub-Contrabass or a Contra Great Bass, while the instrument in F, the largest of all recorders, is either the Double Contrabass or the Sub-Subcontrabass. Both of these instruments are extremely rare, though not out of the question for groups such as large recorder ensembles or orchestras. In a band, the texture would have to be the most transparent the bandestrator could possibly make it in order for either of these voices to be heard.
A Sub-Contrabass in an ensemble (note, this ensemble comprises of 2 Altos, 2 Tenors, 1 Bass, 2 Great Basses, 2 Contrabasses, and 1 Sub-Contrabass)