Many players often ask us why Ríoga Banjos craft their resonators with the curve towards the vellum rather than away from it — a design opposite to what is seen on many American‑made banjos, even at the highest price points.
On instruments such as violins, mandolins, and guitars, the back is curved away from the soundboard for a very specific acoustic reason: this outward curve catches the sound waves produced inside the body and reflects them back toward the centre, where sound holes allow those waves to escape in a controlled manner.
The familiar acoustic principle that the angle of incidence equals the angle of reflection applies just as reliably to sound as it does to light. When sound waves meet a concave surface, they are directed inward toward a central point. In enclosed instruments, this can help sustain resonance — but also risks accumulating unwanted overtones unless there is a dedicated outlet for them.
By contrast, sound waves striking a convex surface are pushed outwards, allowing them to disperse more freely.
A banjo, however, is a very different acoustic environment. The sound must escape not through a central sound hole, but around the outer rim. For this reason, Ríoga Banjos craft their resonators with a deliberate concave curve facing the vellum. This shape deflects sound outwards toward the banjo’s circumference, guiding it directly to the point where it can most efficiently escape.
This design is not decorative — it is purposeful, mathematical, and proven.
It is one of the distinctive acoustic features that gives Ríoga Banjos their clarity, punch, and projection, and is a defining element in the reputation Ríoga has earned for excellence among Irish tenor players worldwide.
