Scott L,
I found that my X1/X4 when used with 2 JBL Eon10G's sounded better if run through a mixer.
Based on the Pro's recommendation I purchased a KP-200S to replace my 2 JBL's and a mixer.
I placed the JBL's a few feet behind me and about 5-10 feet away on either side when I performed. I place KP-200S directly in front of me about 1 foot away. To my ears the KP-200S has more of a sterio and live sound than the JBL's. Although the JBL's together were outputting sterio, from where I played I could tell the direction of the sound and that there were two speakers. (Perhaps that is obvious.) I expect that the sterio effect was more pronounce in the audience.
I recently put on a program in the chapel of a nursing home. It had about a 30' peaked ceiling that was wood covered - very live acoustics. The KP-200S sterio expand sound with the reverb coming from the ceiling was magnificent. The only way to describe it was that I felt bathed in the sound. It was very non-directional. I have found that the sound is very dispersed in the other situations also. Different than two speakers.
I have also found my vocals(I use a VoicePrism) seem to be more forward in the mix and easier to hear with the accompaniment when using the KP-200S compared to the JBL's and a mixer.
I wish that the KP-200S were lighter, but the extra weight for me is worth the better sound (to my ears). With the amp replacing 2 JBL's and 2 speaker stands, I can now move all my equipment with one trip with my cart.
When needed (which won't be very often), I will hook up my 2 JBL Eon 15G2's to the KP-200S to get better coverage in a large venue.
Good Luck!
RJM