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jessie.dazzle wrote:

To my understanding, taken individually, your attic horns would be more obviously working in a half-space environment. For any output that is common to both the L and R channels (some in the case of stereo recordings and all in the case of mono), they would effectively be working as a single horn, in which case they could be considered to be working in a quarter-space environment. To ensure a full-time quarter space environment you could extend the dividing wall (the wall between the two horns) out along the apex of the ceiling. This will not ruin your living room if the dividing plane were made from a single suspended piece of plate glass, without a frame.

Yes, this is very good point and I have thought about it. From a larger perspective I do not like the whole idea of the horns sitting on the same wall, but it is what it is so far.

jessie.dazzle wrote:

Does your attic offer the possibility to make the horns longer?

Yes, I have pretty much unlimited depth of the attic and I am planning to make horns longer then calculated. To make judgment about it I would need to know what kind horn it will be (mouth size) and what kind free air resonance I will be able to get from my Vitavox 15” drivers. Then I will know what will be the length of the horn and knowing the arrival time from that calculated length I will know how I can cheat with the horn depth.

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