The back loaded horn is just one of several configurations of the single driver full range speaker. Horns like the pair Hyfi heard can be very polarizing. Folks tend to love them or hate them.

I enjoy my Frugal Horn MkIII in my bedroom secondary system and they use the larger more efficient Fostex FE126En. But without bass augmentation they sound thin. When I add a pair of OB bass augmentors the sound becomes fully fleshed out. I've never heard a conventional sub even like the well regarded Rel integrate with BL horns like OB bass augmentors.

The main ingredient lacking in BLH I've heard is bass weight, not so much low end extension which is also limited, but the fast bass transients. The Frugals as well the Stereophile rated Hornshoppe Horns differ from the Gemme in that the terminus throat of the folded horn is at the rear rather than the front. A rear terminus allows corner loading which yields better bass response. Triangle speaker sized diffusers can also be used with rear terminus horns when corners are not available. To build a pair though is almost as much effort as building a speaker.

Many followers of full range speaker/SET consider horns the worst of the lot and certainly the most finicky to dial in. There are probably more advocates of transmission line single driver speakers and bass reflex designs. My goal is to build and enjoy all of them. Having built four horns, I've learned a great deal about them.

Hornfest 2012 will be kicking off in my area shortly and it's always an education to spend time with those fun loving cultist horn worshipers. There are guys there who replaced their expensive SET amps with F1's for what they call "high current horn grip" and improved bass. SET amps are not quite so universally loved with BLH as with other FR speakers.

Full range speakers are not for everyone or for every type of music. I covet resolution of detail at low levels as one needs with small group jazz and acoustical music. I crave to hear the "wood" of the instruments in intimate settings. I don't get this with high powered ss amps playing low efficiency speakers no matter the price tag.

I copied "these "advantages of full range speakers" from another source and don't recall where but feel they sum it up well:

1- Midrange is king and that's where they shine. Coherency ( especially nearfield ) is about as good as it gets.

2- One channel of amplification per driver adds dynamics and allows the amp to better "see" the simpler load and increases depth of the sound.

3- Crossovers are evil especially in mid-range where the ear is most sensitive to phase mix ups.

4-Imaging is ideal.

The downside for FR speakers is they don't handle loud complex music as well as multi-driver speakers. I'm in luck here as that's not what I listen to or care about.

I've never heard the Omegas but another forum member here bought a pair only to sell them as he preferred his Tekton Fostex OB4.5.

As much as I've enjoyed the Tektons ( both pair ), Zu's, and Frugal Horns the OB/SET full rangers are way out front IMO. I sold the Zu's to allow more experimentation with OBs.

I'm not sure if the $500 8 inch Tang Band FR drivers I use in OB/H-frames would qualify as Chinese dimestore gear but at least I know I bought sound over bling.