Spend my afternoon today to make my first bird call gadget. It is pretty simple as you can see from the photo. It is made of two big 7.5" and three 3" motorola tweeters which I newly bought from Jakarta. The said tweeters are just secured using taping screws onto a standard packaging foam I got from an electric shop. Tested it with Stress sound track this evening. The result is simply marvellous, I did not even need to turn on the volume to full, easily 1000 birds immediately responded and circulated above my car on two tested sites within a minute. Unfortunately I did not bring my camera to capture the video clip. Hope to do that that in the future.
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