not even a whole sealed box. honestly, theres a little theory you can find at the main section of the site, but its not much. basically make a duct that fits in the wall and rock away.
whats the frequency response like in home IB installs, compared to ported to say 20 hz in home? right now i got a 2.6 tuned to 30 in my room, its fine for music but just takes up to much room