I used to set the cross-over for my speaker at 10hz above its limit. So the cross-over for the SS50C was set at 70Hz. With this setting, the 50C felt small. I seldom felt any impact from my surround speakers.
After I changed it to 100Hz, the front sound stage became huge and uniform. If I remember correctly, Sandy said in a previous post, if you set the cross-over higher, you relieve your speaker from the low frequency duty, it will sound louder and therefore clearer.
Following this principle, I re-set all 4 of my surround speakers to 100Hz, my whole system have never sounded this good before. Every movie/music blu-ray that I had watched sounded so much better now that I've been going thru them like crazy.
I am using the Tritons as large (full range) and let my REL Storm handle the low frequencies of the 50C and surrounds. For movies, I usually listen at -18 to -20 and -12 to -16 for classical/musical blu-ray, depending on the sound level of individual disc. I found that, with the Tritons/50C combo, I can crank the volume up quite a bit.