I would be interested in finding out if there is an audible difference between the X CS Bravo and X CS Encore. I understand the size difference, but in comparison to buying the Bully separates (X CS Bravo and a single boxed sub vs the X CS Encore paired with a box sub)?
Overall, they will be very similar. They both use the same tweeter, and the Bravo uses the same 5.25" woofers as the Bully.
You might get a little lower bass extension from the larger Encore woofers (~5Hz) but placement (room gain) will dictate that more than drivers will.
they both still very lightweight paper cone woofers with a similar suspension and X-max.
in terms of the crossover, the Bully is more similar to the X-CS Encore, with the current network using 2nd order slopes on both drivers. The X-CS Bravo is 3rd order on the tweeter and 2nd on the woofer. (which is what older X-CS Encores had)
You can see the updated measurements of the X-CS Encore on the X-MTM page, as that will be the most analogous to using the X-CS Encore in a vertical orientation, though impedance will be a little different since it's sealed rather than ported.