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Sounds like the speaker probably can't handle the power. Try using speakers that have a power rating higher than the output of your amplifer.
Amazing and beautiful speaker. Well done! However, those 18650s are fake. The largest 18650s on the market currently are ~3400mah. Those fake Chinese batteries are nowhere near 3400 mah and certainly not 6000mah. Panasonic NCR18650Bs are the best 18650s available and could triple your battery life.Test of Fake Ultrafires: http://lygte-info.dk/review/batteries2012/UltraFir...The Real Deal:https://www.amazon.com/Panasonic-NCR18650B-Recharg...
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