After you are done reading your books - biamp your Def-Techs.
They are designed to be biamped. They include the subwoofer which requires dedicated power, but also contains mid-bass drivers, bass drivers, and tweeters. The extra power and separation will give you better sound and more sound at lower levels. Almost everyone I have spoken to who has biamped their speakers, def-tech or otherwise, has been happy they did.
TECHNICALLY, you will be tri-amping your speakers.
Reality is that you have a powered sub built into bi-wireable speakers.