DIY Powered Subwoofer with Passive Radiator Build in reverse

DIY Subwoofer Build in reverse with Passive Radiator and mjølner ( Thors hammer) as weight Hypex Plate amp. fun different Speaker Build 1 x Dayton Audio RSS390-PR 15" Passive Radiator 2 x Tang band 740P 8" subwoofer 1 x Hypex DS 4.0 Plate-amp Thors hammer