An Easy DIY Car Subwoofer Box That Will Make Heads Turn As You Drive Along. - BRILLIANT DIY
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
Classic Diy Subwoofer Kit: The Best Choice - abandonwareblog
Holy Grail of Building A Successful Subwoofer DIY - thiswasmybest