It would be best to bring them over to your system for a listen. No one can know better than first hand experience.
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What you two ought to do is trade speakers for 30 days, if either one of you don't like the speakers they got in trade, then both of you should agreed to go back to your orginal speakers without any hard feelings. It's fun to trade gear with friends, but remember the friendship comes first. Btw, hven't heard the SDA 1B, so really can't comment. Did listen to LSi7 and thought they were good speakers, but didn't get because of my concern with how they would behave with tube equipment.
You will miss the clarity of your speakers if you do the trade. I would just go with a small powered sub. I use a small sub with my B&W 805s two channel setup. It adds just enough bass to make me happy on Jazz and small groups.. I usually turn it off for rock! (apt life)
I have Canton speakers for my 5.1 system, and the CLARITY of the sound is the most noticable important thing with those speakers too.