Model No. Rim Inner Diameter (mm) Throat
(mm) Characteristics SL-47L 24.98 5.85 Smaller inner rim diameter than the 48. Extended endurance. Plenty of volume. Ideal for ensemble and orchestra playing. SL-48DL 25.25 6.62 Same rim as the 48 with a relatively deep cup. Rich low register with a soft tone. Also ideal for euphonium. SL-48L 25.25 6.62 Well-balanced rim and cup with a fairly narrow backbore. Meets the needs of professional players. SL-51BL 25.23 6.92 The 51 rim with a relatively shallow cup. Powerful sound. Popular with ensemble and orchestra euphonium players. SL-51L 25.23 6.92 Relatively large inner rim diameter with large cup volume for a dark sound. Standard euphonium model with a large backbore. SL-51C4L 25.23 6.92 Shallower cup than the 51. Plenty of volume and power. Solid tone throughout the instrument’s range. Ideal for symphony orchestra playing. EP-51DL 25.24 7.11 An even deeper cup than the 51 for a heavy, rich tone. Specifically for euphonium. Ideal for advanced players who prefer a dark sound. SL-52L 25.65 7.11 Larger inner rim diameter and cup than the 51. Heavy tone. For advanced players. SL-53L 25.91 7.11 Extremely large cup. Outstanding middle and low registers. Heavy tone. Ideal for beginning bass trombone players. EP-53DL 26.08 7.11 Good response and tenor-single-like condensed sound. Designed for euphonium players to control the piano sound comfortably and the wider dynamics range at the same time. SL-54L 26.15 7.11 Larger inner rim diameter and cup than the 52. Suitable for larger orchestras. SL-55L 26.35 7.11 Larger inner rim diameter and cup than the 54. Heavy tone. Also ideal for bass trombone.