[PaulP]

Originally Posted by azzzy

Unfortunately there is a rush. I'm way behind schedule (like 3 months behind!) and I need to start recording soon or might as well scrap the whole project and get a day job.

That is a problem . The thing is, in my opinion, treating a room is not
something that can be rushed. I've spent many months studying this stuff
and I don't feel comfortable enough to start myself. The more you read up
on acoustics the more you realize that everyone has a different opinion.
They all make some sort of sense even though they're often completely
contradictory.

This is why I don't trust myself to answer your questions directly, even
though I have some idea of the general concensus on the answers. You
haven't provided any information on the size, shape and construction of
your space nor what you want to do in it. What treatment you need
depends heavily on this as well as your own preferences regarding what
kind of sound you like.

Any direct answers you get to the type of questions you've asked so far
may be completely wrong for your needs. You're talking absorber details
when you/we don't even know if you need any (though several people
around here will tell you to fill your room to the ceiling with absorption and
be done with it).

...As evident from my questions I already picked up some wrong ideas and I don't want to do something based on what I think is right only to find out later I have to re-do everything.

Which is why my suggestion remains that you study enough to get to the
point where you have a good idea of what you need given your requirements.
To do this you'll need a lot more knowledge on the different types of
treatment and how they're used in different situations. One good way to
get this is to read about a lot of other people's experiments. None will be
exactly like yours but you'll see the trends be able to predict something
more to your needs. You're the only one who can do this (unless you hire
a professional and bring them to your place). Your head will hurt but it
would be worth it.

In the meantime, do give us more information on your space and what you
do in it. That is of interest to all.

Paul P