Through the use of various patterns and forms, perforated cardboard

Perforated boards
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Through the use of various patterns and forms, perforated cardboard gypsum boards are a cost-effective and effective solution to use in projects. They absorb sound and lower the noise level caused by reverberation.
compressed fiberboards
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The effect of compressed fiberboards on sound will depend on the specific properties of the material and how it is used. In general, fiberboards are less dense and less rigid than other construction materials, such as wood or concrete, and may not be as effective at blocking or reflecting sound. They may also absorb some sound energy, which can reduce the intensity of sound waves passing through or reflecting off of them. pulp boards
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The effect of pulp boards on sound will depend on the specific properties of the material and how it is used. In general, pulp boards are less dense and less rigid than other construction materials, such as wood or concrete, and may not be as effective at blocking or reflecting sound. They may also absorb some sound energy, which can reduce the intensity of sound waves passing through or reflecting off of them.