I second the concerns indicated by Stan and Dob about the impedance characteristics of the Summit. I've seen specs indicating that its nominal 4 ohm impedance drops to 0.7 ohms at 20kHz. That variation will make its tonal balance very sensitive to the output impedance of the amplifier, even assuming the amp can handle the load. I would not extrapolate from its performance with Dynaudio's, which have completely different (and much more benign) impedance characteristics.
I couldn't find specs on the Octave's output impedance, or damping factor (which equals output impedance divided into 8 ohms). That might be useful information if it can be obtained. Beyond that, I second the recommendation of trying to arrange in in-home trial.
Regards,
-- Al