The Contrabass Flute
The contrabass flute is used for solos and as a bass instrument in choirs. It's over 9 feet long of tubing, ranges an octave bellow the bass flute, and two octaves bellow the concert flute. The footjoint can be adjusted if needed. The diameter of this flute is wider than average to make it sound so low. The amount of air needed for the contra bass flute is not as much as some think.
Here's a video to show you what a contrabass flute sounds like..
Here's a video to show you what a contrabass flute sounds like..