It is a copy of the Sonos subwoofer and its very low end response below 30Hz will be limited although digital signal processing can improve this a little. The person speaking made one large mistake. He called the speaker a dipole. It is not a dipole, it is a bipole. With dipoles the rear wave is 180 degrees out of phase with the front wave. with Bipoles the rear wave is in phase with the front wave. Slot loading the drivers can produce impressive results. The problem with these enclosures is the four large side panels and the top and bottom will be difficult to control and will tend to resonate. It is certainly a design worth listening to. Like any subwoofer a 2 way crossover is required. I do not like smaller drivers trying to make low bass. They tend to have higher resonance frequencies which cuts off their response below and they are not in any way "faster" than larger drivers that do not have to work nearly as hard producing very low frequencies. The smaller driver tends to have higher distortion levels. There is no replacement for displacement.
Subwoofers never fair better in the middle of the room. This is where their efficiency is lowest. Up against a wall you get 3dB better efficiency. In a corner 6dB better. This means lower levels of distortion. Some will say this increases room interaction, not if you use two or more subwoofers. If you form a line array with subwoofers you can minimize room interaction. My own feelings about the subject are here https://imgur.com/user/mijostyn/posts