changing x/o from L&R 2nd order to 3d order

[busterno1]

At the moment i am using a kit I bought with 2 vifa p17 & D25 tweeter in a MTM system it has a 2nd order L&R x/o in it

If I change it to a 4th order acoustic Linkwitz-Riley. 3rd order electrical. this is the one i am thinking of using

http://www.kaiaudio.com/diy2001/kaiopen.html


will i hear much of a difference thanks