I wouldn't know about the DB212 but my regular DB for 10" drivers was too long (on purpose) And when I brought it back to the size it should be, it sounded noticeable better and a bit lower.
But that's just the other way around of what you are asking of course.
Here is the thread about that:
http://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1186436463/26#26