are the specs from Infinity's website and here
is the owner's manual.
I'm afraid there may be a reliability issue with it. I purchased a PS12 less than two years ago (brand new in a sealed box for $120 shipped from a guy on Audiogon whose wife simply would NOT allow a black sub into HER living room). Just last month it crapped out. After doing some investigating I found out MANY of the PS10 and PS12 models have had the same short life spans. I tracked the problem down to a bad relay (#943-1C-480) in the AUTO sensing circuit and the relay even smelled burnt which just confirms my diagnosis... oh and did I mention it was heard doing a lot of rapid clicking before it finally completely died? During my searches I was able to locate the schematics online and found the very same relay is used on many other Infinity Subs, including yours. The bad news is I can't find anywhere to purchase the exact replacement relay. So since I don't really need this sub (got two Rythmiks and an HSU) and since I did get it sooo darn cheap too, I figure my next move is going to be wiring around it by shorting pins 3 and 4 (in essence acting as a closed relay and defeating the AUTO sensing function, which I believe is the problem)... I mean, what have I got to lose? its already busted, ...wish me luck here.
BTW, my PS12 was a pretty decent sounding sub while it lasted... wasn't so much about hitting low and hard but did blended quite well with a couple of vintage Infinity RS5Bs while giving them some added 'umph' down below 40Hz but sounded reasonably well in the mid-bass too... (though not quite as nuanced as the RS5B's own 10" woofers, and therefore the sub was relegated to LFE channel duty exclusively). It was basically for our Home Theater-'lite' in the upstairs living room... the REAL Home Theater is in the basement.