DIY car under seat subwoofer speaker box design and sound test

Today I'm going to reveal how to make low cost sealed car under seat subwoofer speaker box using 4inch subwoofer speaker. I spent less than 5$ for all the project & was an experiment. sound quality was average level for me and best for the cost I spent. car under seat subwoofer speaker box design and sound test
Thank you very much .
Product links
Aliexpress product links
⭐TPA3116D2 160W Dual-channel Stereo ★
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⭐TPA3116D2 240W Dual-channel Stereo ★
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⭐TPA3116D2 100w mono
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⭐TPA3110 amplifier
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⭐50W 40W Amplifier MP3 Decoder Board 12V Bluetooth 5.0 Car Player
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⭐60W Amplifier MP3 Decoder Board 12V Bluetooth 5.0 Car Player
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⭐80W Amplifier MP3 Decoder Board 12V Bluetooth 5.0 Car Player
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⭐160W Amplifier MP3 Decoder Board 12V Bluetooth 5.0 Car Player
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⭐10W 6W Bluetooth Amplifier MP3 Decoder Board Microphone Car Mp3
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⭐10W Amplifier Bluetooth DIY MP3 Decoder Board
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