I had a pair of Alnico 6s a few years ago, before the pandemic. I liked them quite a bit. The image (soundstage) was great but they were quite rolled off at the top and bottom end. I have found this to be true with most single driver speakers. I can augment the lower notes through careful use and matching of subwoofers. I used the Omegas with a variety of amps: Triode Labs 45, Audio Note OTO (EL84), a hand built single-ended KT77 amp and a Macintosh MC225 2-stage PP amp using 7591 tubes. That amp was by far the best match (to my ears) with the Omegas and just about every other high efficiency speaker I owned or tested.
FYI, I also had a pair or Coherent 8s at the same time I owned the Omegas. I spent quite a bit of time comparing the speakers. In the end I preferred the Coherent speakers with my ears, my room and my music. The Coherent 8s were still rolled off, but not as much. I wasn't fond of the residual effects from the Omega drivers And the Omegas sounded a little "congested" compared to the Coherent 8s. BUT, this is my opinion and I was using one model Omega speaker. Louis offers several models and will make custom products. I have no doubt that a different Omega speaker would have compared differently.