I have been "lurking" on these forums for several weeks now and have been absorbing alot of the interesting and informative acoustics related posts that have been made.

If its ok i would like to ask a question or two myself?

I am working on the analysis and room correction of a smallish room (approx 150 cubic feet )which has a ceiling which complicates matters somewhat in terms of mathematically predicting room modes. The ceiling slopes down away from the listening position at an angle of 15 degrees. As any equations/room mode calculators i have seen assume parallel surfaces this poses a significant problem in terms of predicting modal resonances which may cause problems,well, the floor to ceiling axial modes at least.

Much of the research and opinions i have been exposed to indicates that predicting mathematical ideals is of questionable value anyway, so i feel its time to get on with some meat and potatoes analysis of the room using software and a measurement mic. However i can find little literature on the actual procedures and methods which acousticians use to analyse for room modes. Unfortunately the project i am undertaking is outside of my University lecturers expertise (my degree is only partly based in acoustics and our only acoustician has recently retired) so i am pretty much on my own on this one.

Which brings me on to my question. Would anyone like to share some knowledge with me and give me some pointers as to how i can go about identifying troublesome room modes by way of actual measurements and data interpretation?

I have REW and a couple of other well known pieces of acoustics software and access to an earthworks M50 measurement mic,clean preamps etc.

In addition to having my head perpetually stuck in acoustics books and research papers i have searched these forums with not much joy so any help or pointers would be greatly appreciated.

Kind regards and many thanks

Chris