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We present sound diffusers based on locally resonant metamaterials that are one order magnitude thinner than the classical designs based on phase gratings. Using a set of waveguides loaded by an array of optimized Helmholtz resonators, we induce strong dispersive propagation inside the material. Doing this, waves in the low-frequency regime are dramatically slowed down and, because of this, a deep-subwavelength resonance is produced. In addition, this design allows an accurate tuning of thedoi:10.18154/rwth-conv-239375 fatcat:m4xxjt2lrzfuja5tjkno6of54q