I can compare the Cubo to the Redsound Elis 8. Elis 8s on 7 is the same approximate volume as the Cubo on around 3.5. Wasn't expecting that... In fact, I initially had the volume on about 2, and thought something had to be wrong with the amp.
The Redsound, um... sound is mellow and smooth. Maybe too smooth, to the point of "are they really FRFR?" There's something really nice about the Elis 8s though. You can tell they are meant to be essentially audiophile speakers. They are also nice and quiet.
This tells me that the Elis 8s will not compare with the Fender FR-10s once I get the V2 preamp installed in them. However, they are really nice in my basement studio.