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Jessie,

When I spoke that I would go most likely for exponential I did not mean the Exponential vs. Hyperbolic but rather that it would not be a Tractrix. I have no specific preferences for Exponential, Hyperbolic or any other long profiles. A common sense suggests then the longer profiles shell be better for lower frequencies but in my case such a statements would not be backup by any of practical experiments. Frankly speaking even among the people who do use long horns it is also VERY difficult to make a definitive assessments about which long profile is better. At the “frequencies of the interest”  (40Hz-150Hz) the coupling with a specific room is way too important and it is virtually imposable to make an objective and methodologically clean assessment what profile is better even if someone one would have two identical long horns in the same room (can you image someone so courageous?!!)

So, if I was in your shoe I would discard whatever Romys and others say and would talk to the guys who build the horns. Talk to John Hasquine, talk to Jeffrey Jackson, talk to Bruce Edgar, talk to Martin Seddon, talk to the Le Cleach guy (I do not remember his name but he is your cosine and you shell know)  Bruce is particularly a subject of interest as he has a lot of practical and theoretical experience and he also personally has a very good discrimination for the results. You will not sense this discrimination if you will be his client, Bruce knows that his clients are mostly deaf idols who can’t distinguish results anyhow, but it does not mean that Bruce does not know how to make the things better and his advice would be voluble. Do not take anything that anyone say as the fact but rather use it as background to make you own decision.

You are engaged in a serious project. Why don’t you to let people to bid for the idea of your midbass horn. If I were you I would compile a resume of my being built acoustic system attached with request for people to come up with ideas of a “honest” 45-50Hz horn. I would even install some kind of prize for a most beneficial suggestion…  I would do in the end anyhow for whatever I personal would feel works out better but it does not mean that I would not listen many other who might some experience in the field…

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