  The interplay between disorder and topology leads to rich phenomena such as
topological Anderson insulator phases, where disorder opens a topological
bandgap and thereby enhances transport. With the recent advances in
non-Hermitian topological physics, topological Anderson insulators have been
generalized to systems with non-Hermitian disorder. However, achieving
disorder-induced nontrivial point-gap topology, which is unique to
non-Hermitian systems and is responsible for non-Hermitian skin effect, remains
elusive. In this work, we experimentally realized non-Hermitian
disorder-induced point-gap topology in a one-dimensional acoustic crystal. By
controlling the gain factor of the amplifier in each basic unit, we obtained a
series of disordered unidirectional hoppings with tunable strength. Using
disordered acoustic crystals under open boundary conditions, we observed the
emergence of non-Hermitian skin effect and the direction reversal of skin mode
localization when the disorder strength is tuned. These results serve as
hallmarks of point-gap topological phase transition induced by non-Hermitian
disorder. Our work paves the way for exploring various disorder-induced
phenomena in non-Hermitian acoustic systems.
