DIY Active Subwoofer : 15 Steps (with Pictures) - Instructables
DIY Party Music Kit w/ Two Powered 15" Speakers and 18" Subwoofer | Zeo Brothers
GSG Audio Design - Elite Subwoofers
Seas L26ROY Subwoofer Kit
Amazon.com: HiVi-Swans 2 Way Passive Bookshelf Speakers Pair - DIY Speaker Kit-Peak Power 120 Watt Bookshelf Speakers for Surrounds or Front : Electronics
Uxcell Loudspeaker Frame 10 Inch Speaker Stand Reverse Woofer Basket Speaker Repair Kit for Subwoofer 2 Pack - Walmart.com
The Hammer DIY Subwoofer Build - GSG Kit - Order with code:Jilesgsg - YouTube
Falcon Acoustics | The Leading DIY Speaker Parts and Kit Supplier since 1972
Amazon.com: CYOEST DIY Bluetooth Speaker Box Kit Electronic Sound Amplifier - Build Your Own Portable Wood Case Bluetooth Speaker Sound - Science Experiment and STEM Learning for Kids, Teens and Adults : Electronics