  In this work we study one problem of mathematical interest for their
applications in several topics in Applied Science. We study simultaneous
controllability of a pair of systems which model the evolution of sound in a
compressible ow considered as a transmission problem. We show the well posed of
the problem. Furthermore provided appropriate conditions in the geometry of the
domain are valid and suitable assumptions on the fluid, is possible to conduce
the pair of systems to the equilibrium in a simultaneous way using only one
control.
