AVS Forum Special Member
Join Date: Aug 2001
Location: Lynnwood, WA USA
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If you are planning an acoustically transparent screen, there should be plenty of room behind the screen for the speakers without modifying the walls. Are you planning on tearing into the walls and/or using wall mounted speakers? If so, there is always a concern about what is behind the walls. The chances are, plumbing for a kitchen won't take up too much space. You generally have a 2" drain line and a couple of 1/2" supply lines. Those will often run across the ceiling to join up with the main "central stack" for the bathrooms, which is typically a 4" drain pipe. On the other hand, it is possible that the main stack is behind one of those corners and the plumbing from the bathrooms is running across your ceiling to that area.
I'd suggest reading through the forum to see how others have built their theaters and the problems that they have encountered. The more time you spend, the more you will learn from what others have done. I would suggest taking a look at the soundproofing thread that is stickeyed at the top of the forum. It has become bloated over the years, but it has some good information, especially at the beginning.
Once you can get some pictures of the space, feel free to post them as they will often make answering questions easier and more accurate.