  We numerically study the energy transfer in a multi-component $2d$ film, made
of an active polar gel and a passive isotropic fluid in presence of surfactant
favoring emulsification. We show that by confining the active behavior into the
localized component, the typical scale where chemical energy is transformed in
mechanical energy can be substantially controlled. Quantitative analysis of
kinetic energy spectra and fluxes shows the presence of a multi-scale dynamics
due to the existence of a flux induced by the active stress only, without the
presence of a turbulent cascade. An increase in the intensity of active doping
induces drag reduction due to the competition of elastic and dissipative
stresses against active forces. Furthermore we show that a non-homogeneous
activity pattern induces localized response, including a modulation of the slip
length, opening the way toward the control of active flows by external doping.
