PA of the Day - This is a a DIY subwoofer from 3RDKLTR soundsystem from Portland, Oregon USA. "THAM 15" design made out of 3/4 inch birch ply. 15" 8 ohm JBL
How to Make a DIY Cylinder Subwoofer (aka Sonosub) - Spinditty
Homemade Subwoofer | 3D Warehouse
Building A DIY Sealed Subwoofer | Audioholics
The V.B.S.S. DIY subwoofer design thread | AVS Forum
20 DIY Subwoofer Projects: How To Build A Subwoofer Like A Pro
The V.B.S.S. DIY subwoofer design thread | AVS Forum
build my own subwoofer | DiyMobileAudio.com Car Stereo Forum
5 best DIY subwoofer components [Home Theater]
How to build active subwoofer of 100W - Quora
How To Make A Subwoofer Amplifier At Home With FAQ'S