You said are lucky to get hornloading down to 150Hz. Then I guess you suggest you will end up at maybe 175Hz. Hornloading a compression driver down to 175Hz is not too difficult and the horn will not be larger than the Avantgarde Trio midbass horn, at least not in diameter. Horns and compression drivers go together, cone drivers and horns, not so much. For bass, yes, maybe. Bass is not so detailed for our ears anyway. In the area our ears are detailed, why not use a driver for our horns that is built for this purpose. One can pretend a cone speaker is compression drivers but it will not be the same. If you are dead set on cone drivers at ~200hz, then maybe do direct radiators everywhere. The Avantgarde Duo had a famously poor bass because of the mix of direct radiators and horns at this area.
Compression drivers under 200Hz is still a theory for me, and I will have to verify it after a few weeks in the garage.
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