Installed these on my Arduino laser tag for sound effects and they are LOUD! I hooked them up to a small amp using an eBoot 6 Pack LM2596 DC-to-DC Buck Converter 3.0-40V to 1.5-35V Power Supply Buck Module, Super Mini PAM8403 5VDC. Pack of 2 and 2 modules Aideepen YX5300 UART Control Serial MP3 Music Player for Arduino/AVR/ARM/PIC. Everything connected, the sound is clear + very loud. In fact, I had to turn the amp down a bit for the recitation to be reasonable.
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