The Denis Wick Tone Boosters are designed to fit most mouthpieces to increase the mass or weight at the cup of the mouthpiece. This allows the player to get a bit more energy into the horn without additional effort. They also help stabilize the mouthpiece to make it easier to "lock in" to the notes.
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Comments about Denis Wick 6182L Bass Trombone Mouthpiece Booster:
These boosters indeed increase your sound production 10 - 20%. They also help hold the sound together at ff dynamics. However, they actually slot really well and as a consequence your slurs will tend to be a bit blocky. This is especially true of partial slurs. So, on the one hand it's nice to have the mouthpiece/booster center the pitch/tone, but on the other it leaves little room for gliding up and down the partial range as smoothly as one would like. It is worth making the adjustment though.
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