The repeater itself is a stainless steel single-circumference and two-hammer system, meaning that the gong goes around the outside of the watch only once (as opposed to the longer gongs on a Cathedral Gong minute repeater) and the watch chimes two tones (as opposed to a carillon-style with three chimes). The sound is beneficially amplified by the fact that the gongs are affixed directly to the case, allowing better sound propagation.
While I’m not one of the lucky handful in the world that has multiple repeaters on hand to compare and contrast, I do get a chance to listen to them relatively often. Anecdotally, people say that rose gold is the ideal material and gives a “warmer” sound, but I haven’t seen any legitimate test that proves that as fact. To do so, I’d argue that you’d have to recase the same movement into all different materials and eliminate the variable of the movement itself. That said, I do think this is one of the louder repeaters I’ve heard in recent memories, and satisfyingly warm without being too “tinny” as you will sometimes find with certain examples.