A quick word on soundproof foam (it's a myth!)
We often get asked about where to put soundproof foam, how to install soundproof foam etc. Sometimes it is just a case of the wrong terminology, sometimes it is a misunderstanding of what 'acoustic foam' is actually for.
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Sound absorbing foam (the type used in acoustic foam tiles) is for reducing echo/reverberation and improving sound quality.
It won't stop sound leaking in or out of a room. That requires mass - normally in the form of additional plasterboard walls and ceilings. It is complex, expensive and beyond the scope of this page... so for the record there is unfortunately no such thing as 'soundproof foam'.
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With that all being said, let's answer the question of where to place acoustic foam for improved audio quality in your studio.
Well. if one simply wants to go through the motions, one can certainly paste them all over the place in places one 'feels' (as we have no measurements) that they will do 'something' - quantitatively - we don't know what - but you can be assured it will be little or nothing appreciable... One can certainly bask in the feeling of believing that one has solved a problem. The placebo effect is certainly a real phenomenon. And "different" equates to "better" for many.
They may also have a few extra Spiderman beach towels available that they could hang on the walls too. I have heard that they can address early reflections and potentially divert their path - if not stop them dead in their tracks due to 'intimidation' (a more obscure acoustical phenomenon). (I also have it on good authority that Ricky Martin posters can be effective in scaring reflections and causing them to literally leave the premises entirely!)
Or, wry hyperbole aside, one can instead follow best practices and actually affect a quantitatively verifiable improvement.
They would be substantially better off by utilizing 2-4 inch thick fiberglass or Rockwood panels for early reflections and to define the ISD gap and more substantial bass traps for modal behavior.
The tiny squares are going to do little for early reflections (although they might help a 'bit' on surfaces for the remediation of flutter echo), and they will do absolutely nothing for modal issues -the most significant issue facing him currently in the small space.
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