Ilkka posted his measurements over on the HometheaterShack... is worth a look at some of the top running commercial subs, as well as some DIY stuff, including the TC-Sounds LMS-18 in multiple configurations.. That LMS is an Incredibly Astonishing driver... WOW !! Oh and let us not forget the SVS-Ultra13.. Very Very capable driver !! The Measurements are remarkable. http://www.hometheatershack.com/forums/subwoofer-tests/8144-subwoofer-tests-round-5-6th-october-2007-test-summary-read-me.html I hope posting this is OK.. I believe these tests are valuable information and a great learning tool...