What does one purchase after owning horns?

I am unfamiliar with horn speakers. Why can't they play bass without the attached sub? Need to be too big to do it?

Used zu def2. You get the best of both worlds.

Inna,
the subs on the smaller avantgardes are a compromise to avoid having to
use a huge bass horn to produce low frequencies. If you have the space & cash they have the Bass horn. But this would probably be to big for many users.

Soundlab if you have the proper amplification.
What amps are you going to use?

What amplification for Sound Labs?
I used the somewhat dry, but very, very quiet and seemingly distortionless Halcro. Then, the DK (later LSA) Integrated amp, which has 150 Watts and doubles into lower impedences.
One of the reasons I bought the DK company back in 2005, was based on its comparative performance with the Halcro...frankly, I was stunned.
The sound in my room (large by my humble standards) 23x26x18 feet, open into a second story loft, and behind me, a vaulted kitchen (two casement doors 6' each)--so lot's of cubic feet, and they filled it up, for MY taste, in terms of volume and musicality.
Just a comment--likeing or even loving one product is not an attack on another. I like some horn speakers, but they, to my ears, have a coloration that I do not prefer.
Dynamic, yes, muscical, somewhat, integrated with bass, somewhat. Generalizations all--yet if Duke is involved (Audiokinesis) they're going to be really, really good.
I respect his opinion and work.

Good listening (don't forget to buy Renee Olstead)

Larry