A single Seductor can put out 4 watts per channel. It's pretty tolerant of different speaker types, but to play absolutely any kind of music at realistic levels you would probably need speakers of around 96 dB sensitivity. That said, I wouldn't hesitate to use Seductor with Orcas. That setup won't shake the house but it will sound lovely at more moderate listening levels.
Seductor is designed to be priced such that one might consider buying a couple. In which case you could either stap each stereo amp into an 8 watt monoblock, or possibly more intriguing if you have a two way speaker, biamp your speakers with one Seductor running the tweeters and one Seductor running the woofers.