I owned a GS112 and an S15XD and ran them together for a while. The pair together sounded terrible honestly. I always thought I liked the scooped sound of the GS112, and paired with the BE's mids, I thought it would be a nice match.
Turned out that the GS112 really couldn't hang with the "muscle" of the S15XD, and really got drowned out. I sold the GS112, and I started using the BE alone from that point on. The BE by itself had way more girth and volume than the Aggie, and came really close in the low end. In fact, it was close enough to not bug me much at all.
Later I added an S-15LD and the low end is HUGE from the LD/XD stack.