DIY corner bass traps. “Help”.

Hello all!! I currently in the process of treating my own mixing and mastering room in my house. I’m building corner bass traps. My dilemma is I see “everywhere” that everyone covers their panels and traps with cloth. But I was going to cover mine with acoustic 1-1/2” or 2-1/2” foam. It would be easier and look nicer, and I’ll get the extra thickness for more sound absorption. “So I think” but I may be blocking the audio, thus not letting the traps do their job. Please help. And thank you. Cloth or foam. Thanks again. I’ll post pics.
 

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I don't think its going to affect the absorber tuning at all. As said before, the open cell PU foam is transparent to LF in the thickness you used. It will just act like an absorber alone with added mid frequency absorption from the foam.