I picked up my JBL S312 Series 2 speakers yesterday. At this time I cannot give them a review since I have only used them 4 hours or so. I would like to give my initial impressions on the look and feel of these speakers as well as make a few comparisons to the old series in terms of build and looks. I hav'nt owned the old series nor have I spent more than a few minutes listening to them so I will never be able to compare the two. As far as I know the old series was around for at least a few years and I doubt JBL would make a series two unless it was better. I am sure they found a few flaws in the first series that they have corrected in this series. Practice makes perfect right! Also it seems to me that JBL is making a big effort to get a piece of the pie. I now have about 20 hours on my S26 (series 1) speakers and JBL now has my full attention. (btw the S26s get better and better with use!!) Things that have not changed: The series 2 s312 is still a 3-way floorstander 250watts max power handling 92dbs sensitivity 35hz-20khz frequency response crossover frequencies 750hz and 3000hz>> (in other words the 12" driver is responsible for frequencies from 750Hz on down, the 4" mid driver deals with everything from 750Hz to 3000Hz and the 1" tweeter deals with 3000Hz on up. I am sure most of you know that but just in case I though this might be helpful) Things that have changed: Series 1 size is 41"Hx16"Wx12-7/8"D Series 2 size is 41"Hx14-3/4"Wx12-1/4"D So the baffle is 1-1/4" thinner and its not as deep on the series 2. this would will help eliminate any baffle diffractions. (incidentally as I understand it, that was not a problem on the first series) In any case the baffle is now about as thin as you can get a speaker with a 12" bass driver. Series 1 weight is 68lbs Series 2 weight is 77lbs The new series weighs 9lbs more. Basically the speaker is a little smaller and weighs more yet it still extends down to 35Hz(+/-3dbs) More than likely this means the 12" driver is different and either it has a larger motor and/or the cabinet is built a little better. Also the mid-range is definatly different..visually it has a smaller rubber surround than the old one. Considering this driver is only used from 750-3000 it certainly would'nt need alot..so perhaps this driver is more precise? I am not sure, but I am sure JBL had a good reason to change it. The old series used gold colored drivers The new series uses a silvery/leadish colored drivers The old series used a black ash finish(correct me if I am wrong) The new series uses a black maple finish. You have to see this black maple, it really is a beautiful color...kind of a light black, with a silvery white tint to it. The old series used some plastic feet that extended out from the cabinet. The new series uses some very practial rubber feet that are underneath it and in the center are holes for installing the spikes that come with the speakers. There are a few other minor cosmetic differences as well but I won't get into it. Overall these are quite beautiful speakers IMO. I will make a small comment on their sound quality right now and will give a more detail review later on. Out of the box they sounded quite bright, almost shrill...after 2 hours or so it eased up and after 4 hours its gone...the speakers are already breaking in. Bass is tight and natural..I was concerned they would be to boomy. When I read a few reviews on audioreview,com about these speakers and people complained there was not enough bass...I was pretty certain that these would give real bass. Those folks are most likely looking for Cerwin Vega style boomy bass. So when I read that a 12" bass driver based loudspeaker has no bass , I took that as a good sign. The other thing I will say is these are detailed as heck and I am very excited to listen to them some more today on this fine spring day!! That's all for now.