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Dresden,

So the first two could actually be just one actual build, with alternate rear chambers? 
Wouldn't you change the throat size, as well as the compression chamber size? 
Then arrive at your "optimized" compound horn design.

Then you could compare this to design #3 which would be a straight FLH, correct? 
This may be the best way to do it, to hear the difference, to "prove it to yourself" rather than the suggestion Romy made about the third paragraph. 
I had to go through all that mess, and learn the hard way... 
I really thought the compound horn design was a good idea @ one time too... 
Robert 

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