Ok after running audyssey which set the sub at 80hz and down and -12 like it did with my last sub I threw in war of the worlds, impressive to say the least. went through a few more movies and was ecstatic to finally hear the low frequency content that I knew I had been missing. I too come from the car audio world where 130db+ at 10hz isn't too far fetched in a good system for example a picture of what is behind my back seats:
I have a very good ear for sound from my car audio days and usually tune by ear for flat response in-car which as you may know is much more challenging than in the house because of a multitude of surface reflections, road noise etc but without getting too far off topic. It was not until I played a test tone from 100hz down to 5hz that I was truly impressed. To my ear which I will disclaim is not as accurate as testing equipment which I do not have thus this will be purely subjective, the empire place about five feet away from my main seating position played flat down to 20hz with no problem and was definitely going lower but its harder to gauge since you cant really hear it. From my experiences in tuning my cars, this is the best frequency response I have ever heard from a sub with little or no tuning, I guess this is what home audio is all about since I usually have crazy peaks and dips in the freq response of subs in the car.
In other words, it sounds beautiful, the midbass output is indeed impressive and the only downside I have found is that it is more localize able than what I have used before but at the same time it is not bad at all considering that by assumption, two fifteens in what looks like is barely 3 cubic feet would typically be a very high Q design as it it shouldn't be dropping low like this. Even small box oriented subs in the car environment in this size of box would need a bit of boost in the low end so it amazes me that in the home, without the benefit of a 20-30db boost in the low end that you get from the automotive environment, the empire drops as low as it does. Back to the test tones, to my ear, the only dip in the frequency response was a very small one around 50-60hz but this is most likely related to the characteristics of my room. Sorry if Ive rambling as I have never really given a subjective review of something before.
I know you guys are waiting for ground plane measurements and in home frequency response graphs and sadly I cant provide this until I get the proper equipment (im working on it) but hopefully this initial impression will tide the forum members over until we get some of the professionals to take some measurements. To sum it up, I am very impressed with this sub and need to spend more time with it, most of my listening was done at a low-medium volume since i live in apartments and it was late but it is a VERY musical sub and most car audio guys would kill to have the flat response that this sub has, it is obtainable, but it takes a hell of alot of parametric bands to do it. I have no regrets taking the plunge on this thing sigh unseen and wish Epik the best when they sort out their move and get a full product line up and running.
Also, the form factor amazing considering what this thing is capable of, it looks much better than any sub Ed makes and although not as pretty as the higher end SVS subs, it should pass the WAF with flying colors, it has a look that is utilitarian but sharp. I love it and cant wait to get home to let her rip.