Recently a friend of mine built a sort of three-sided, top-closed soundproof "booth" using plywood and sound-absorbing panels. The "booth" is about 1 meter 75 high, one meter wide, and one meter deep. The voice has no reverb and is dry, but it sounds boxy; do you think this problem can be solved with mixing?
http://urly.it/21c9tin in this link there is an example taken from the web of how he built the booth, the only difference is that it doesn't have one side (it is open behind him)
I haven't seen the project, but anyway he built a sort of vocal booth. The boxy voice might depend on the microphone quality. It is difficult to say if it can be fixed in post-production without hearing how it comes out of the mic. Send us a file and we'll see. In any case, regarding the vocal booth, it is incorrect to say that it is soundproof; if it were soundproof, it would be closed and you would hear almost nothing from the outside. By putting sound-absorbing material inside, it has been acoustically treated to dry out the sound and ensure that only the direct voice is recorded without reflections, which is what is usually done when recording vocals.
Great, that's exactly how it is! I don't know these things, I'm learning them right now and I like it!
In fact, this vocal booth, as you call it, has been acoustically treated to dry out the voice and acoustic instruments, minimizing reverb as much as possible, and from what he let me hear, it's really not there.
In my opinion, rather than being boxed in, his voice has many low frequencies, and since he is inside such a small "cabin" acoustically treated with sound-absorbing panels, it's normal for the sound to result in being much more closed.
He has an AKG C 3000b microphone which he told me is a classic. Now I'll have him give me a recording so I can let you hear it!
I wouldn't call a C3000b a classic. The classics are the AKG 414, the Neumann U87, now we could also include some Brauner models, certainly not the C3000b which costs several hundred euros less.
