  Topological physics strongly relies on prototypical lattice model with
particular symmetries. We report here on a theoretical and experimental work on
acoustic waveguides that is directly mapped to the one-dimensional
Su-Schrieffer-Heeger chiral model. Starting from the continuous two dimensional
wave equation we use a combination of monomadal approximation and the condition
of equal length tube segments to arrive at the wanted discrete equations. It is
shown that open or closed boundary conditions topological leads automatically
to the existence of edge modes. We illustrate by graphical construction how the
edge modes appear naturally owing to a quarter-wavelength condition and the
conservation of flux. Furthermore, the transparent chirality of our system,
which is ensured by the geometrical constraints allows us to study chiral
disorder numerically and experimentally. Our experimental results in the
audible regime demonstrate the predicted robustness of the topological edge
modes.
