REL T-ZERO MK3...nizzzze

Just picked up the REL T-Zero mk3 to supplement my Sonus Farber Concertinos. Wow, NOT what I expected. I’m still in a state of disbelief over the improvements across the spectrum, especially soundstage and I already had a pretty decent soundstage and I’m still dialing this thing in. Can’t believe what I’ve been missing and all I was expecting at best was a lil’ bump up in the low end. This little sucker is perhaps the best $480 I’ve spent on gear. 
If anyone has any words of wisdom on how to best dial-in the crossover/volume or recommend sound tracks to mess with that would be much appreciated.