Recently visted a new BH and found internal tweeter used for playing external sound. The sound can can be hear very loud near the enterance hole, but I am sure it would able to travel far. I advice him to change those currenty used tweeter to those external type with longer horn so the external sound able to travel far to attract swiftlet that travel high up aboe the BH.
As for the internal and nesting area, I advice him to install more tweeter and also add some corner and fake nest. Will follow up with him any changes he has been done and update the BH progress again.
Here the type of tweeter he is using for external sound. What do you think the effectiveness of the tweeter for external sound?
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