Home › Cornet › Bach 9 vs Kelly 6V

Bach 9 vs Kelly 6V

The Bach 9 has a wider cup diameter, the Kelly 6V features a deeper cup, the Kelly 6V has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
    Bach 9
    • Cornet
    Throat diameter3.66 mm / 0.1441 in
    vs
    Mouthpiece B
      Kelly 6V
      • Cornet
      Dark/Deep
      Throat diameter4.06 mm / 0.1598 in
      Best suited for
      📣High-volume projection — open throat for power
      📋Deep V-cup to fill out cornet sound

      Throat Diameter

      The Kelly 6V has a wider throat (4.06 mm / 0.1598 in vs 3.66 mm / 0.1441 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.

      Which is better?

      Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.

      Open in interactive tool + Add third mouthpiece Bach 9 details Kelly 6V details Bach 9 equivalents Kelly 6V equivalents

      Compare Bach 9 with others

      Compare Kelly 6V with others

      Popular Cornet comparisons

      Bach vs Kelly

      Browse by specification