[THESIS IN FRENCH] This research adresses the themes of digital fabrication, complex formwork and architectural acoustics, which it interrelates through a research by design approach. Its main objective is to develop a design process based on an acoustic performance parameter and a fabrication technique for concrete that will be suitable to generate future projects. The first chapter identifies the main digital manufacturing technologies for the production of non-standard concrete formwork. A method to be explored is then selected: wax formwork milled by a three-axis machine, a reusable material that therefore does not produce waste. The second chapter focuses on the generation of these complex forms by exploring the potential of architectural acoustics coupled with genetic algorithms to inform them. The following sections aim to develop a methodology for the creation of wax formwork, while defining the limits and validating the advantages of this production method. The objective is to subsequently transpose these features into the creation of a genetic algorithm that automates the iterative process of simulation, analysis and creation of an optimal non-standard acoustic geometry. To achieve this, the moulding of various concrete prototypes is performed, according to which a specific wax manufacturing method is developed. A series of specific recommendations for the modelling of these formworks results from these physical tests. Pursuant to the previous findings, genetic algorithms coupled with a simulation by ray tracing are defined. They generate a curved acoustic concrete reflector that distributes sound uniformly to a specific area, an element that exploits the low absorption coefficient of this material. This work is subsequently applied and informed by the execution of a concrete concert hall project that is the result of this feedback between theory, practice and design.