The pre-owned Bo A1 I purchased came with an odd lingering smell. After carefully opening it up and letting it air out for two days, the odor disappeared—only to reveal a more annoying problem: terrible low-frequency vibrations!
I was convinced I’d damaged the speaker during disassembly and felt completely defeated, even contemplating selling it for scrap parts.
Then, by pure chance, I stumbled upon a Bilibili tutorial that changed everything. The solution? Simply stuffing tissue paper into all the screw holes. Unbelievably, that quick fix worked like magic—problem solved in seconds!
Naomi Banks 
Willa Roberts 
Hazel Snyder
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