We just received yesterday a pair of DZR 12's & a pair of the DXS18XLF.
Running program music through them, the 12's run away from the subs quickly!
I guess I'm lucky that my gigs don't require much volume. I get away with 2 PRX715XLF's (clustered) with my DZR12's and they do fine. I'm doing live jazz/rock/folk bands not DJ/EDM stuff, but it is outdoors (reasonably small areas). That said, the subs are getting close to their limit and I'd quickly run out of sub if I needed more. The PRX715XLF's only weigh 56 lbs each though, which is why I keep hanging on to them.
The DZR range is a level above the DXR range, so no surprise that the sub can't keep up. That said, you almost always need multiple subs to keep up with a decent top.
Any idea if Yamaha is planning to release an upgraded sub line? DZSxxXLF?