I wouldn't bother with any measurements. All they are going to show you is that you need lots of low freq. absorption. Even after you install a bunch of bass traps and your room sounds better, guess what, the measurements will still say "more bass trapping"!
Check out this article:
RealTraps - How To Set Up a Room
Check out products from RealTraps and GIK Acoustics. Foam isn't going to cut it.