I took a quick look at the Bose manual, and it appears that the Bose speaker wire is two-strand, and that it's bare at the speaker end and terminated with an RCA connector at the "bass module" end. So, on the speaker end, you should be fine to hook up the DefTechs; and, on the other end, if you cut off the RCA connectors from the wires, you should be able to hook them all up to an AVR.
One possible issue: Since all Bose speakers have to plug into the "bass module", it's possible that the wires are only long enough to reach the "bass module" in its current location. If that's the case, you may be constrained to placing your AVR in that same location.
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