5. Bore Size
The bore of the trombone has a big effect on the sound of the instrument, and is measured by the diameter of the
BottleneckA glass or metal tube used on the ring or little finger to play slide guitar. In computing, 'bottleneck' describes the slowest part of a system in cases where this limits overall performance.slide
tubing. Trombones with larger bore sizes have a darker, heavier sound, but require more effort to play. For an orchestral instrument, its usually 0.547, but jazz models can be 0.450 or 0.500. Student models commonly have a bore of 0.525.