Efficient sound absorption at low frequencies remains a major challenge, as most architectured materials rely on resonant mechanisms that limit their bandwidth. Here, we demonstrate a nonresonant approach based on resistive materials coupled to soft acoustic boundaries and show its effectiveness in different setups. In a reflection configuration, a critically coupled wire-mesh layer combined with a foam yields a high and broadband absorption over the investigated frequency range 10–6400 Hz. When considering a transmission configuration, placing a side hole near the wire-mesh layer breaks the mirror symmetry and results in a low-frequency and broadband one-sided absorption. This work opens new opportunities for acoustic materials by leveraging the potential of resistive materials for low-frequency and broadband wave manipulation.

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• Acoustic metamaterials
• Acoustic modeling
• Acoustic wave phenomena