Cavity noise control is a highly demanded research field for the manipulation of noise in vehicle interiors. A very ambitious application is the aircraft fuselage, presenting many challenges related to the simultaneous necessity of blocking sound transmission and absorbing acoustic energy, while fulfilling strict weight and spatial constraints. Many innovative solutions are being investigated, such as subwavelength resonators, porous materials and hybrid composites combining resonant and porous elements. Also, classical active noise cancellation has a vast literature for controlling cavity noises in vehicle interiors. The active impedance control concept instead, with its advantages related to inherent acoustical passivity and stability, has recently prompted its technological readiness level, but still lacks of proper optimization models. Generally, in acoustics, a surface is used to be characterized in terms of its impedance and absorption coefficient. The consequent optimization is based upon the maximization of the absorption coefficient, which means the minimization of the reflected sound field. Nevertheless, the criteria for optimal damping of acoustic cavities, either at a single frequency or in a frequency bandwidth, do not coincide with the maximization of absorption coefficient in the corresponding frequencies of interest. This is due to the impact of the surface impedance scattering upon the global sound pressure field in the acoustic cavity. In the sound scattering, an equal role is played by both resistive and reactive impedance components. For this reason, the optimal resistance depends upon the reactance, as it is the case for the equivalent well known problem in solid mechanics, of Tuned Mass Damper optimization. In this paper, we discuss the significance of absorption maximization in comparison with classical modal damping optimization criteria coming from the solid mechanics literature. Finally, a preliminary test-bench has been built in order to test the impedance control in a small acoustic environment treated on one side by electroacoustic resonators, and preliminary modal attenuation results are discussed.