There is considerable hearsay and amateur opinion about sound quality differences in horns that are multicell vs. sectoral. For example, the original little horn on the Altec 604 and 604B (multicell) vs. later incarnations. Since it is subjective, there are opinions on both sides as to which sound better. I would like to find out more - to understand a bit more objectively as to the "why"...

I've done some digging around for some scientific papers on this topic, but it is sparse and either crap or reads more like a doctoral thesis. Here are few I've found that are fairly understandable:

Wide Angle Dispersion of High Frequency Sound - Abraham Cohen

The Quadratic Throat Waveguide - Charles Hughes

FOH - Understanding Horns - Phil Graham

Anyone have any better links?