I own the Sovereign Power and it is true that the binding posts accept bananas. But I managed to remove the protective plastic around them to use my Argento Flow speaker cable that have spades termination.
Regarding amplification power I believe that if you want to enjoy the full dynamic range that these speakers can offer, even a Sovereign Glory could be challenged. To be honest I believe that the Contriva should be driven by a set of Sovereign Eternity monoblock amplifiers. These speakers need a lot of power. I recently tried the Sovereign Power (165Wrms) with the Tidal Piano Cera and it had some difficulties when music was very loud. The Glory would be a perfect match for the Ceras.
Regarding amplification power I believe that if you want to enjoy the full dynamic range that these speakers can offer, even a Sovereign Glory could be challenged. To be honest I believe that the Contriva should be driven by a set of Sovereign Eternity monoblock amplifiers. These speakers need a lot of power. I recently tried the Sovereign Power (165Wrms) with the Tidal Piano Cera and it had some difficulties when music was very loud. The Glory would be a perfect match for the Ceras.