I'm sorry to say but I've had EON-PAK 15" speakers with 4 band eq (used mostly as floormonitors) but if you play loud like we sometimes do these speakers don't fit at all.
Serious feedback problems at reasonable volume and no clear brilliant sound IMO.
Our saxophoneplayer recommended cheap Powerworks monitors (made by HK-audio in Germany) and these are perfect for the job unless you need real high volumes.
I have never heard the SX series but other series from EV are very good so if I had to choose between those two i'd buy without any doubt EV...