  In this work, we provide a proof-of-concept experimental demonstration of the
wave control capabilities of cellular metamaterials endowed with populations of
tunable electromechanical resonators. Each independently tunable resonator
comprises a piezoelectric patch and a resistor-inductor shunt, and its resonant
frequency can be seamlessly re-programmed without interfering with the cellular
structure's default properties. We show that, by strategically placing the
resonators in the lattice domain and by deliberately activating only selected
subsets of them, chosen to conform to the directional features of the beamed
wave response, it is possible to override the inherent wave anisotropy of the
cellular medium. The outcome is the establishment of tunable spatial patterns
of energy distillation resulting in a non-symmetric correction of the
wavefields.
