Two Spanish guitars, east Indian rosewood back & sides, Lutz spruce soundboards, one with ebony binding, one with north Indian rosewood. With steel string guitars, the aim is to coax out more bass and warmth from metal strings that are otherwise naturally bright and shimmery. The nylon strings used for Spanish guitars tend to sound quite warm, and our goal for concert classical builds is to construct an instrument that is warm, but also clear, articulate and powerful. In this case, given the high stiffness of the Lutz soundboards, we utilized a parallel 5-brace structure that's a nod to builders in the Domingo Esteso-Conde Hermanos lineage.