Sorry I can't answer your specific frequency response question, just wanted to add a couple thoughts based on my experience. When I saw that the deepOMEGE 12 was rated from 28hz to 160hz my first thought was GREAT !!! I have a little experience with this in kind of a home brew solution over the past 3 years. I've been looking for a great speaker designer that would hone in on a Music Specific sub that works in a higher frequency range (compared to traditional subs) where most of the Bass resides in music.
This interactive frequency chart demonstrates that most music has very little going on below 40hz. On the other hand a lot is going on well up into the 150hz range (run your mouse across the chart for more info). Note the other chart off to the side indicating how much ear sensitivity to frequencies below 150hz starts to drop off. So in my book I'm looking for a music sub that will play up into the 150hz range (if I need it) to compensate for the human ears lack of sensitivity to frequencies below 150hz. IMO this is why many speakers can sound a bit thin on the low end. The speakers frequency response can be flat but the human ears sensitivity to lower frequencies is not.
http://www.independentrecording.net/irn/resources/freqchart/main_display.htmFor most a lower output limit of only 28hz would seem a limiting factor. My experience is a fast driver capable of playing clean up into the 150hz range is the most important for laying down and expanding the sound stage foundation. It's pretty common knowledge to go really low requires bigger heavier drivers (Slow). Higher frequencies require much lighter drivers (Fast). Louis has traded off the extreme Low End (where not much music happens most of the time) for a much lighter faster driver that is capable of going cleanly up in the 150hz range where there is a lot more going on and the human ear is less sensitive.
I don't mean to be speaking for Louis in any way, just my opinion based on my experience and I like what I see in the deepOMEGA 12 specifications so far. I think the pickle for a manufacturer like Omega geared toward accurate music reproduction is selling a sub that does not go down to 16hz as most of us have been conditioned to think. Personally I don't care if the deepOMEGA is -12db at 28hz. To me the attractive part is to be able to play reasonably flat and with accuracy between 40hz and 150hz.
So if your #1 priority is music, I would encourage that you try not to get too hung up on how low the deepOMEGA 12 will go and how much it rolls off on the low end. I have a re-purposed Home Theater product that I use to reinforce the 50hz to 150hz range in my system, it rolls off quickly below 50hz. I would take this over my 15" traditional sub any day for music reproduction. What I see in the deepOMEGA 12 so far seems to be a much more elegant and refined product that plays lower. I wish this had been around 3 years ago.
