The Antoine Courtois Paris AC551 New York series bass trombone with Hagmann valves is engineered for advanced players who need clarity, power and smooth response across all registers. Featuring the Swiss-designed Hagmann valve system, it delivers efficient airflow and even tone throughout valve transitions. A 9-1/2" one-piece yellow brass bell provides strong projection with controlled focus, while a .562" bore and ergonomic hand grip support comfortable playing and precise slide work. With an independent valve configuration and interchangeable leadpipe to tailor resistance, the AC551 adapts to a wide range of orchestral, solo and studio applications. Finished in lacquer and supplied with a large shank mouthpiece and case, it’s built for serious musicians who expect reliability and refinement.

Hagmann Valve System Enhances Airflow and Tonal Consistency

Players who value smooth response and effortless transitions benefit from the Hagmann design featured on the AC551. The independent valve setup and open-wrap F-attachment maintain an unimpeded air path, giving clear articulation and steady projection from Bb through valve-dependent notes. Yellow or gold brass options shape tone according to player preference, with yellow brass offering brightness and clarity and gold brass adding warmth and breadth. The ergonomic grip supports longer rehearsals, while accurate tuning across Bb, F, G-Gb and Eb-D facilitates confident performance in ensemble and solo settings. With durable construction and a sound tailored for expressive phrasing, this bass trombone provides a dependable partner for demanding repertoire. Purpose-built for advanced technique and full tonal presence, the AC551 New York series bass trombone combines precise engineering with the nuanced voice Antoine Courtois instruments are known for. Its adaptable airflow, controlled projection and comfortable feel make it a trusted choice for players seeking expressive performance in orchestra pits, concert halls or recording environments.