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This is the deepest of the Studio Master cups. It is a balance of ample "bowl" in the top of the cup with a gradual "V" shape into the throat area. This cup is decidedly deeper and more "V" shaped than its predecessors. This cup has the same bowl in the top of the cup as the preceding cup, but the throat area is opened more adding additional volume to the cup. This can add extra depth to the tone and provide extra vibrating room for the lips. This cup has a bit more room in the walls of the cup. The shallowest of the Studio Master cups. The extra room in the throat area of the cup (bottom of the cup, or entrance to the bore) allows more air to flow through more quickly. This extra room also lets players with fleshier lips play a shallower cup than they generally are able to play. Not only does this allow for the lips to vibrate more freely, but it is an important factor in the robust sound that the Studio Master pieces are known for.
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The top part of the cup has a great deal more room just under the rim in the walls of the cup. The yellow arrows help to highlight the differences in cup design. This is our version of the Symphonic or #24 back bore. The "C" back bore offers a step between the average standard back bore and what most players have come to know as a Symphonic or #24 back bore. The profile is slightly tighter behind the bore and flares just a bit more at the end of the shank than a standard Bach back bore. The standard back bore is taken from Vacchiano's own signature mouthpiece.
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This adds a touch more resistance and a level of control for many players. This back bore is just a bit tighter right behind the bore opening than the standard Vacchiano back bore. All Vacchiano models are available in the sizes shown below. A tighter bore leaves a longer back bore, a larger bore leaves a longer straight section in the bore area and can spill over into the back bore area, especially if the back bore is small and tight. The size and profile of the back bore affects the velocity of the air and hence the sound produced. The Back Bore is the internal profile of the shank area of the mouthpiece. It begins just behind the straight section of the bore.