Parts Express on Twitter: "Quite possibly the smallest self-contained subwoofer system, Tang Band's T2-2181SA pairs a long throw 2" driver with a high excursion passive radiator in an ultra-compact enclosure allowing you
Voxel Passive Radiator Subwoofer Plans - Etsy Sweden
Passive radiator | HiFi Sono DIY | Audiophonics - Audiophonics