The internal bracing is amazing. Best I've seen, love it!
Obviously a 24" will put an 18" to shame when comparing the numbers...although I don't get free samples of the SI subs 0FYIW the SI 24 inch series will put a pair of UM 18's to shame.... I now have one IB 24 and my ported UM 15's dont even compare....the output below 25hz is astonishing....
Of course I realize its a different price range.... But to be fair my SI IB24 is the roughly the same price as 2 UM18's
Nice...thanks for the recommendation. I need to add a few movies to the repertoire.congrats on the new subs... try the first 1 minute of LIVE DIE REPEAT / EDGE OF TOMORROW for a real ultra low LFE test