Unless there's something I'm not understanding, I don't think these issues can be fully solved with an in-cabinet sub. Room placement will always be an issue with a sub, so i don't understand how an in cabinet designed sub can change this.
It'll always be luck of the draw if the built in position will work or not - unless your able to determine the optimal position in advance and then build the sub into that spot.
Edit - just saw Ian's post, replying at the same time. I wonder how an in cabinet design differs to manage placement issues with room modes? Very cool on the upcoming in cabinet design EP500 however!
Last edited by cb919; 09/10/11 03:29 PM.