I have some Dayton RS180S-8 and RS28f-4 drivers that I want to use for some HT speakers. My room does not accommodate floor-standing speakers positioned away from walls. I built a test enclosure that I have tested. The drivers have very nice response when located more than two or three feet away from a wall. In this configuration, I could make a really nice 2.5 way design with very flat frequency response. When positioned against the wall, however, I get some pretty severe cancelation between 150Hz and 250Hz. The enclosure depth is six inches. I'm not sure I see a good way to prevent this behavior. I considered a 2.5 way design using the second woofer to reinforce the attenuated frequency range. I am concerned that this will not help much because the same cancellation mode will apply to both woofers. I could se some ideas from anyone who has Experience with this issue.