I was considering the E22 by Rythmik as it is roughly a third of the price of the REL 212 SX. I have heard some REL line arrays with three subwoofers stacked on each side that seem to fill the room with well detailed low bass even at low volumes. My budget will not cover a line array or even a pair of 212 SX, but two E22's is doable. I also have to please a wife who took some convincing that the two La Scala's would not overwhelm the room. The E22 would hide in the corners. Horn subs that I have seen are simple too large to get by the wife. As Rythmik is sold direct, i can't go to a dealer and listen to a pair. I have read that they are very fast and very musical. I don't listen to any bass heavy music, but I do appreciate how a good sub is able to fill out the mid-bass. Reviews I have read and seen on Youtube suggest that the F series at Rythmik are close to some of the lower end REL Subs. Thanks for all of the input. I will let you know what I end up with.