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There are other problems here

I have always been concerned with the Unity approach because it seems to discount the fact that the sound from the drivers closer to the mouth also goes back down the horn body and reflects off of the other drivers thereby creating a secondary sound source which is significantly delayed from the first - usually a bad thing. The extent to which this is a problem is unknow to me since I have no data, but at first look it appeared that this could be an achiles heal to the design.

Perhaps Tom has some data that he can share showing the unEQ'd frequency response of a unity horn on axis. Seperatly for each set of drivers would be most enlightening.

Now for Pro usage, which I think was Tom's target application, this design has some real merits in its ability to "cluster" the multiple drivers required for very high SPLs into a small package. The tradeoffs here are very different and I might prefer Tom's approach to the line array approach that we see so often and which has some eal problems itself. But for home use where SPL is not a problem I think that there are cleaner approaches to the problem.

Earl Geddes

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