Yes that's exactly what I was referring to, the size of the actual throat opening. I'll have a go at flying the horn response program and have a look see at what happens when the throat area is manipulated up and down. Does driver xmax factor into this? Most older drivers had smaller xmax than some of the newer offerings. If you have double the xmax would you need to generate the same compression ratio for a given horn? Regards Moray James.
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