MJK's Fostex FF125wk BLH project

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Here is the measurement, taken about 2" outside the horn mouth.
 

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I am sorry to hear about the driver. Have you measured near field driver output both with the horn running and then with the final sections filled with damping material to spoil the horn. The difference will indicate how much radiation resistance and at what range the horn contribute.
 
This is interesting. I am corresponding with another European who was mentioning 6mm plasterboard. Is this a common construction practice? I believe that my 35yr old house has 1/2" drywall on 16" center 2x4's. I think that this is still standard practice. 5/8" drywall is also commonly available.

Bob

Plasterboard is common in modern UK houses, used as stud and partition walls between rooms, particularly in timber frame buildings.
 
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