The Omegas are not a back loaded horn. They are just highly damped monitors. That's fine with most drivers but with Fostex or Lowther it don't work. Since I'm stating my humble opinion, from someone who has listened to both and currently owns both. The Lowthers that I own are DX4s in 2nd Rethms and the Fostex are in a Cain and Cain single horn Bens. If your amp is strong in the bass and is all around neutral, then the Lowthers may be ok. If your amp is a little airy like most SETs then you'll need the extra weight that the Fostex do. The Lowthers do seem a little more transparent, but at the end of the day I can't get past the peaky highs. The Fostex are all around a more natural sound. If the amp is push pull, then maybe and only maybe(listen at home) the Lowthers. But I know the Fostex will work either way without a home audition. I tried everything to like the Lowthers, Decware Gizmos,Cardas cables, you name it.BTW, I've also owned the Omegas and they sound just like Lowthers. There highly damped box just don't work with single drivers. They will have no upper bass, like the left keys on a piano. Not low, low, bass but bass nonetheless. I'm just trying to help another old A-goner who has been here since the good old days.