The Kicker L7s definitely prefer bigger boxes, but if the box is designed properly you can make up for a lot. I had one '06 Kicker l7 15 in a 6 cu ft (NET) box, tuned to 30 Hz with a little under 2kW rms and it was almost as loud as my 2 15" audiopipe setup. It's just not as clean sounding. I have high expectations for the 2k8 version, though...higher motor force, less heat....