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Throat Exponent The throat exponent is the math used by GR to design the radius that enters the bore of the mouthpiece from the cup. In the past, manufacturers have used terms like "shoulder" or "second cup" to describe this area of the mouthpiece. By using defined mathematics, GR can design specific rates of change to this area of the mouthpiece, and he knows the playing result before the mouthpiece is play tested. Furthermore, different exponents match certain trumpets or certain cups.
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