We are working on treating one of our "studios" at school, which is used for video recordings.
The reason behind this project is that it currently sounds like a bathroom.
We have thus collected stacks of egg-cartons (I am actually quite aware of the limitations and why it is usually not recommended... Apparently, it is at least effective at around 640Hz.) We have actually received quite a lot from a local chicken farm, so we are going to continue nevertheless!
What side of the cartons should be facing forward? (The side that holds the eggs or the reverse? The reverse seems like a better idea, as the texture is more rough.)
The cartons are also going to be painted for aesthetic reasons. What paint should be the best, considering acoustics? I recommended a matte finish, but I could not name any specific type.
Also, what would be the best method to attach the cartons to the walls? We have considered glue gun or "sticky gum" (not sure what it's called - blue tack or something) as well as affixing the cartons to a plywood sheet and then standing this sheet up against the wall.
After the egg-cartons, what would the next step be? I have read that bass traps might be necessary, but in what specific scenario would that be recommended?
(Just for extra context, the room is partially carpeted and contains a variety of furniture.)
Please take into account that this project is running on minimal or no funds.
Thank you in advance!