I've a pair of these for monitoring on stage in a band situation.
TBH, I wouldn't use them for FOH. They deliberately (because lows for monitors is not a good idea!) have next to no lows, and aren't really flat by any stretch of the imagination.
I doubt they will sound better than the built-ins on your S950, but I'll be interested in hearing your experiences.
Unless I added a small sub, I wouldn't use mine, that's for sure.
Wrong again Diki ...I just got home from the gig and the SRM150 sounded fantastic in the small glass room atrium I was playing in,.....it filled the room just right for the small amount of people there ...I was very impressed and will definitely add it to my arsenal.....it gave the right amount of projection I thought it would....a very kool piece of gear.
And my back thanks me too

.....bringing the DXR12's into a room little this and a few others I perform at would have been such overkill it ain't funny...this little gem on a mic stand is the ticket. It's a keeper for sure.