This was something rare but I saw it being used by one BH owner and it works.
The owner uses medium size piezo tweeters as his internal sound tweeters.
As far as I know normally we recommend the use of small size tweeters either the 4"X4" square of the 2"X5" size. However this BH owner uses the 3"by 7" tweeters.
I was very taken back with his approach but then it works.
He placed the tweeter on the wall far away from the nesting planks (about 1.5 foot below). What happened was those birds build their nest on the cement wall about a few inches away. They seem to like the sound so much and prefer to be closed to the tweeter.
I was taken back and feel very surprised. Well as I always says that the more you know them the more you need to know about their mysterious behaviours.
I am sure I will make this as an option or goodies for any new BH. What the hack, if they like it then we just try.
My recommendation is to install a few at some strategic locations, not more then 4-6 of these medium size tweeters per floor (20'X70'). Play internal sound on them.
You have nothing to loose as long as your internal sound is perfect.
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