Totally Left field idea,
For $200 and REW Free software you can play with your existing speakers EQ. This would allow you to see what your speakers are actually doing in your room. With that information you can compare any new speaker frequency response to what you all ready have, or with EQ changes a goal response rate.
Keeping the Behringer in you system is totally optional in the future but can be a useful tool for where you are now
Good Luck and Enjoy The Music