But what I have been considering is using something like the audiophile 7 pi corner horns with the full range drivers. I have several "full range" drivers, some vintage, some new, and they all lack satisfying bass.

So, what about using the corner horns to augment the full range speakers?

Beyond that, can anyone give me an idea what to expect if I built the full 7 pi system for use in my small room (about 13 x 16 feet with a 9 foot ceiling)?

Thanks,

Mark