How to tune front chamber of front loaded horn?

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I have an 8" driver loaded into a 100cm front loaded horn. I have read how to tune the rear chamber but is there a method to tune the front chamber? Currently i have a 16mm deep front chamber which is 200mm in diameter for the driver to fire into before the horn throat reduces to 100mm.
Do I need to reduce this or take measurements?
 
The interplay between Small-Thiele parameters in front-loaded horns is (mathematically) complex; the SW program that has implemented this to a rather comprehensive stage is 'AJ Horn'. I have used this in my newly created thread of March 2017.
Succes! Wim Martens
 
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