Warburton Trumpet Backbores (Standard)What size backbore do I need? 1, 2, 3 The tightest commercial sounding backbores. These models have a concentrated and intense sound. The #3 is the most popular of this series. If offers a bright, projecting sound that is great for lead players and outdoor work. 4, 5, 6 Tight to medium. With progressively less resistance, these models produce a bright and very projecting tone. The #5 is by far the most popular with strong lead players. Q New in 2004,
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