Covering soundproofing question?

Hello, My workmates and I work in booths with the walls covered with foam soundproofing. We have an argument. Some say that it's OK to cover the walls with cloths, posters, etc. I say that if you do that, you are making the soundproofing useless, as it is the shape of the foam that the audio waves need to... show more Hello,

My workmates and I work in booths with the walls covered with foam soundproofing.

We have an argument.

Some say that it's OK to cover the walls with cloths, posters, etc.

I say that if you do that, you are making the soundproofing useless, as it is the shape of the foam that the audio waves need to hit. Hitting a sheet will reduce the ability to absorb the sound.

Which is correct?

Sources would be appreciated.

Thanks.
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