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be wrote:

Regarding the shape of dazzies horn: I can only see a decorative reson to make it round, I dont believe that round is better than rectangular in this range, in fact a rectangular shape will make a much better coupling to the room boundaries possible and extend the useful range 1-2 octaves lower, depending if dazzie can place it against a floor (or ceiling) and a wall.

Well, I do not think that it would be as much as 2 octaves but rather a .5-.7 octaves at it’s max but still the point is extremely valid. Unfortunately I do not think that there is a final judgment on it. I would also intellectually agree that round might not be better than rectangular in this range but what for our intellectual analyses would be the definition of “better”?

If a round bass horn is crossed at 240Hz with a second order then I would question that rectangular horn is the ultimate shape. The problem is that the differences might (or might not) be only in the very fine details of imaging, that it VERY difficult to judge or to compare. Even if someone would make, let say 100Hz, round and rectangular horns then it would be also very difficult to observe the imaging differences as this range the relationship between the horn and room would be too influential.

So, if I were doing that project I would not care about “decorative reasons” or “imaging rational” it will be no conclusion in there anyhow. I would rather ask myself: how many times in life a person has guts, stupidity, conditions and courage, not to mention the wife’s blessing, to build a round 45Hz horn? I never seen anyone who did it twice but I have seen very many people who did it zero times…

Still, being adult and pragmatic, and taking under consideration that you “be” is very correct - with boundary loading I might consider the following: if I go for segments (let say 5-7-9-11 segments) and then if I decided to ceiling-load my horn then I would NOT need to remake the horn but only to change the bottom profile of one or two segments. I think it would preserve the “decorative objectives” of the roundness but at the same time it would be utilitarian enough to serve the might-be-changing RTA’s objectives.

Rerurn to Romy the Cat's Site