transducer said:Keep the woofers as close as possible to each other, otherwise you will get comb filtering effects off axis vertically. Also cross over as low as possible. Another option is to put both woofers on the bottom.
Peter Daniel said:My main concern now is should I go with WTMW configuration (like WAR kit) or place the 2 woofers at the bottom. Something tells me that first option might be better after all.
transducer said:The comb filtering will not be between the mid and tweeter, but rather between the two woofers if they are placed in a WMTW configuration.
Peter: It seems like you've got your mind made up even before you've asked the question, so why bother asking? I've refered you to sound physics information that shows the potential problems you will have, and pete maze has also recommended TMWW. Here is a piece of software which you can play with to show you what will happen in a WMTW situation. http://www.pvconsultants.com/audio/radiation/downloadarpe.htm I'm not saying it won't work, but be aware of the potential problems. Or don't bother asking and just do what you want.
As to the whole IB idea, I'd be tempted to do a proper dipole with correction for the bass cancellation of front and back waves. You'll get much less room interaction that way. I know you've seen Linkwitz' web site and think it's too much circuitry, but it's sound scientific stuff and works. I've built a dipole sub based on his work and can tell you that it is the most natural sounding bass that I've heard, ever.