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Amazon.co.jp: Bluetooth 5.0 Speaker, Wireless PC Speaker, Smartphone Speaker, 10 W High Output, Loud Volume, Small, Portable, Built-in Microphone, Stereo, Long Continuous Playback, PC, Tablet, USB : Computers
What is the range of frequencies that 1. A microphone on a(ny) smartphone 2. A loud-speaker of the type playing music at gatherings will allow to pass ? More specifically, do they
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