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AIYIMA 1Pcs 4 Inch Subwoofer Speaker HIFI 4 8 Ohm 50W Woofer Speaker Super Bass Sound
10 subwoofer bandpass enclosure Best subwoofer box for deep bass Compare Car Subwoofers - AliExpress
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4 Inch Subwoofer Audio Speaker | 4 Inch Midrange Speakers | Mid Woofer Speaker 4 Ohm - Speakers - Aliexpress
1PCS 80W 6.5 inch subwoofer speaker 4 8 ohm home theater car audio modification upgrade high
Excellent TDA3116d2 version of the sw-105 subwoofer/amp board from aliexpress. Solder joints are excellent they've used plenty of flux here, the rest of the board is well labelled so easy to mod