  Newtonian fluid dynamics allows the construction of acoustic metrics from
which black hole configurations can be studied. However, relativistic pressure
effects are neglected within Newtonian theory. We study acoustic black holes in
the framework of neo-Newtonian hydrodynamics, which is designed to take into
account relativistic inertial effects of the pressure $p$. Within this new
hydrodynamical context we show how $p$ can influence the formation of the
acoustic horizons.
