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green heron wrote:

I'm happy with my results midrange on up at the moment, but I'd like more slam from the midbass horns.  The backchamber may be a bit too large, so I'm planning to experiment with the cabinet volume.  Do you have any suggestions to tell what the ideal cabinet volume is and what the typical sound characteristics that indicate if a backchamber is too large?

Yes, you will have more “slam” from the midbass horns if you tune your back chamber. When your backchamber is too large the lower knee of your midbass sound very light, you get more extension and bass accent with back chamber properly tuned. I had guidance how to do it.

http://www.goodsoundclub.com/Forums/ShowPost.aspx?PostID=2991

My article was written for as your midbass that has slow beginning of the opening. Your horn is conical and I do not know how they behave. Conical horns are reportedly very unpredictable and you woeful never know how they behave. So, you need to drive your Fs up and down to see how your conical horns will response to it.

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