I have not used the SSi to specifically speak on it, all I have at the moment is to go by what I can find on the web at TREOs website. I am surprised these two are being compared, as Xmax / cone size / power handling / etc. etc. are all somewhat different, showing that these two sub woofers not really meant to go heads up against each other. Yes, power ratting yadda yadda is not much to go on, but it is one of many things to show how different these sub woofers are. Does anyone know if the specs TREO lists for Xmax is P2P or one way, as I am curious about a true 27mm one way, being attainable with the 4 spoke as the Xcon with 31mm is right at the limit of the 12 spoke which has more clearance then the 4 spoke the last time I checked. Yes, the TREO has the cone size advantage, but from what I can see, that is where the advantages end. The Xcon is the newer design and incorporates a shorting ring to help lower inductance. As for classifieds, a much larger, much older brand is always going to get more attention then SSA as far more people know who TREO is, then SSA simple as that. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif