Tang Band sent me their PR15-A subwoofer bundle with a beefy 4 inch driver and passive radiator. Built into a small 3 litre enclosure, this thing can hit down to 33Hz! Watch the build in this video and a sound demo at the end.

Visit the Tang Band website here to find out more: http://tb-speaker.com
Tang Band W4-2089 4.5" RBM Mini Flat Panel Subwoofer 4 Ohm - (US) https://parts-express.sjv.io/LPAZqL
Router bits from Banggood.com: https://www.banggood.com/custlink/vKK...

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