King 4B Sonorous trombone, made in the mid-1970s during the era when King instruments were known for their robust craftsmanship and tonal clarity. This model features a .547 large bore setup with an 8.5” yellow brass bell and standard nickel silver handslide. It accepts a large shank mouthpiece and is a true symphonic tenor in every sense.
The condition is excellent throughout, with all original parts intact and a high-quality refinish completed prior to arrival. The handslide is straight, aligned, and very responsive—ready for immediate use with no service needed. This is not a garage find—it’s a well-cared-for professional-level instrument built to perform.
A great fit for advancing students, college players, or professionals looking to add a reliable large bore horn to their lineup. Especially ideal for King 2B or 3B players seeking something bigger without leaving the familiar King feel and sound.
Includes the original King case, which is still in good working condition with minor cosmetic wear on the exterior. This instrument has been fully shop-serviced, inspected, and play-tested to ensure peak performance.
How does the King 4B compare to other large bore trombones?
The 4B Sonorous has a broad, centered tone with excellent projection—ideal for symphonic and wind ensemble settings. It maintains a lighter feel compared to some modern orchestral models, making it comfortable for extended sessions.
What type of player is this model best suited for?
It’s perfect for a jazz or commercial player stepping into symphonic repertoire, or a classical player wanting a vintage American sound with responsive slide action and bright presence.
Is the King 4B a dual bore slide?
No—this is a straight large bore .547 model, which offers consistent airflow and tonal stability across all registers.
This King 4B Sonorous has been sold and is now part of our Archive of Sold Instruments.
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