Going to purchase a pair of SDA 1A's, need some technical help

I recently found a listing for a pair of SDA 1A's on craigslist, and i need a bit of help to make sure that they will work properly with my current audio system. I have a pioneer VSX-1020 receiver, my left and rights are currently Sony SS-U780's and they're hooked up to a polk PSW10 through high level inputs. What im mostly concerned about is that I need a common ground amp for these to work with the interconnect cable, and I have no idea how to tell if my receiver is. Also if it isnt, then is it still possible to run these speakers without the interconnect cable and still get an acceptable sound? Thanks.

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