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Not sure on the drivers to be used yet, will probably get them from partsexpress.com. They have a good selection of free air drivers. I have done some testing so far in terms of placement. Surprising none of the corners of my listening room provide an even response at the listening position. I get a very boomy peak at 40-50hz and the true low end does not get any boost that you would normally get from corner loading.
There is one location that would be perfect but it is just not practical to have the subwoofer in this location. Where the "throat" of the IB would enter the room provides some boost as it is about 1.5 meter from the rear left corner. So many variables, I think like you said I could try a temp box and see what happens. If I do go with the IB option I will have to double the drivers, minimum that would be useful would be 4 15". And all those pesky room vibrations throught the house....
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