Yamaha Trombone, Large Shank
Model No.
Inner Rim Diameter (mm)
Rim Contour/
Thickness
Cup Depth
Throat (mm)
Backbore
 Playing Characteristics
47 24.98 standard/
standard		 standard 5.85 standard Smaller inner rim diameter than the 48. Extended endurance. Plenty of volume. Ideal for ensemble and orchestra playing.
48 25.25 standard/
standard		 standard 6.62 semi-narrow Well-balanced rim and cup with a fairly narrow backbore. Meets the needs of professional players.
48D 25.25 standard/
standard		 semi-deep 6.62 semi-narrow Same rim as the 48 with a relatively deep cup. Rich low register with a soft tone. Also ideal for euphonium.
51B 25.23 standard/
standard		 semi-shallow 6.92 semi-wide The 51 rim with a relatively shallow cup. Powerful sound. Popular with ensemble and orchestra euphonium players.
51 25.23 standard/
standard		 standard 6.92 semi-wide Relatively large inner rim diameter with large cup volume for a dark sound. Standard euphonium model with a large backbore.
51C4 25.23 semi-flat/
standard		 standard 6.92 semi-wide Shallower cup than the 51. Plenty of volume and power. Solid tone throughout the instrument's range. Ideal for symphony orchestra playing.
51D 25.24 standard/
standard		 semi-deep 7.11 standard An even deeper cup than the 51 for a heavy, rich tone. Specifically for euphonium. Ideal for advanced players who prefer a dark sound.
52 25.65 standard/
standard		 standard 7.11 semi-wide Larger inner rim diameter and cup than the 51. Heavy tone. For advanced players.
53 25.91 standard/
standard		 standard 7.11 semi-wide Extremely large cup. Outstanding middle and low registers. Heavy tone. Ideal for beginning bass trombone players.