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#21-inch subwoofer #Subwoofer #Outdoor audio equipment Use your discretion in viewing: This ranking is a rough ranking. If there is any incorrect information, I apologize here. (Which speaker model is good to use or if there is no information about the speaker model that you like, don't forget to comment and share your experience below.) Thank you for watching the channel. 21-inch cast speaker link (below) 1. NEXON brand, model 21F6-V4 http://www.tpesound.com/index.php?lay... 2. GIP brand, model GPA-2125 http://www.seangpaisan.com/SPEAKER-%E... 3. NEXON 21F5-V2, speaker 21 / 1926783527420694 4. Iba speaker 21 inches 3006 http://www.ataudiopro.com/%E0%B8%94%E... 5. GIP model GPA-2199 http://www.sahasound.com/speaker/Spea... 6. KANE model Chana II 21 inches http://www.seangpaisan.com/SPEAKER-%E... 7. OBOM TRUMP21 http://www.dewcomspeed.com/product/19... 8. NANOVA model NNV-211A http://www.srsound.co.th/index.php?la...