Combining the micro-perforated panel, air gap, and porous material under a multi-layer composite absorber framework has been proved to help obtain absorption enhancement. Theoretically and experimentally, the multi-layer system can extend the absorption value and associated bandwidth, although the desired improvements are not always present. For this purpose, theoretical models, experimental validation, and sensitivity analysis are performed where woven fabric, air gap, and nonwoven are considered as micro-perforated panel, air gap, and porous material, respectively. It is expected that this leads to a better understanding, particularly of the most critical parameters affecting associated behaviors. This understanding should be beneficial for a practical design procedure amid many parameters involved in the composite textile material. For the same textile materials, the results show that not all parameters involved are important in determining overall behavior, while influential parameters dictating the resulting behaviors are different for different sequences of elementary textile material in the multi-layer composite. This suggests that selecting optimal design parameters in the multi-layer composite needs great care.
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