A friend of mine has 4 swan diva 6.1's with the matching center and no subwoofer in his living room, I can attest to they do not need a sub, he wired all the 8" drivers to a separate amplifier that just feeds the sub signal. When he was explaining it to me I was like "wtf, this is going to be an abortion"... but it works... I think he did all 8-8" drivers on the sub amp but it may have been just 1 in each cabinet, I know he tlaked to swan and they told him how it would work... The system sounds very good... I also heard just a pair of them wired full range for music with a pair of tube mono blocks, quite the speaker for $500, I thought they were $1500 a pair, I almost want to buy a set rit enow after looking at the site...