The original design of the Salzedo model has an extra-wide sounding board at the bottom end, as did the 11, but the Salzedo was the widest, as I recall, perhaps 21 3/4 inches. The column design is made of elements in numbers of five, five layers to the column, five levels from bottom to top. Recently, L & H added a sixth layer at the bottom of the column for their own reasons. They also narrowed the width of the sounding board to match the 23 for a more ideal sound, someone once told me. I suspect Salzedo’s concept was to capture some of the sound of a straight-sounding board, and combining it with the oomph of a wide bass. Now the effect is somewhat different.