Room acoustics - yet again


I have the books and the theory of room acoustics for rectengular enclosed rooms. Any guidelines for irregular (ie partly-cathedral ceilings, multiple openings to the listening room) ? Or is it the usual measure-listen-change ? My problem is finding a reasonable starting spot and tewak from there.
ikarus
Nomoney - yes, drapes, blinds and furniture will help enormously ! Before doing anything, wait until all furniture etc are in place. If you still have slap-echo, consider hanging stuff on the walls (I had a small oriental prayer rug one time). Actually, I found out that cathedral ceilings is actually a blessing - you don't have to worry about reflections from the ceiling too much. My problem is that my ceiling only goes half-way to the room, then drops down. This causes a placing problem for my speakers.

Thanks for the tips guys...
Thanks for sharing your experience, Subaruguru. My speakers are sealed cabinets and do well in a near-field setup. The software referenced above was only $50. For that much it won't have to do much to provide a decent ROI. Unlike you I have no WAF to consider, so can setup where ever sounds best (which is the current plan!).

Interestingly, after doing the usual over analysis of the situation my conclusion is similar to yours. While this new room is 'irregularly' shaped, that does not mean it isn't somewhat 'symmetrical'. My hunch is it's characteristics largely balance out. For example, the 'L'-shaped living room area is open on both ends. The kitchen is on one end, the hallway to the bedrooms on the other. There is also a small office area that adjoins the bedroom end of the space that has double doors that can be opened or closed depending on which works better.

In fact, 'space' was a key consideration in picking this place (it took 3 months of searching to find it). Now, for the first time, there will be adequate space between, behind AND beside the speakers. They'll actually have room to breathe. Can't wait! The only thing left is to actually do it. Everything else is just part of the challenge.
Ikarus, Thanks. I am hoping that is how it turns out. I might go ahead and try to have some things on hand to try and tame it down if needed. You know you can not go to sleep after moving into another house without the the stereo at least starting to sound right.
Yeah.. I know. I also know the feeling : 'leave the damn boxes where they are ! You can sort out pots and pans later ! Give me a hand with the speakers !' :)
I am going to build a large separate-from-my-house building just for two channel audio. I am thinking 40'x40' or larger.

Does anybody know of any plans that include recommended material for the floor, walls, ceiling and wall angles, etc?

I would like to take this plan to an architect so that he can draw up something that will 1) pass building code and 2) allow a general contractor to begin building.

If there are no known plans, does anybody have an architect that they recommend? I am in Raleigh, NC.

Thanks!