The wood shop in my rather large retirement community makes and sells a TON of these every year, especially around Xmas. Looking it over with a new eye since thanks to BFM I now have a gnat's knowledge of what "Horn-loading" means and BINGO! It's nothing more than a horn. This constantly amazes people - we have them play music on their phone then drop it down into the rectangular slot and BAM - 5X volume increase.
Horn Loaded Cell Phone Amplifier
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Re: Horn Loaded Cell Phone Amplifier
Some people taking this idea to the extreme....
https://www.youtube.com/watch?v=8FXPUkg3i60
https://www.youtube.com/watch?v=Jh_mIKwr5cU
https://www.youtube.com/watch?v=8FXPUkg3i60
https://www.youtube.com/watch?v=Jh_mIKwr5cU