DIY Bookshelf Speaker with 4.2 Audio System using 2.5" Full Range Speaker Unit and 4.5" Subwoofer - YouTube
Amazon.com: Pack of 2 Full Range Bookshelf Speaker, 3 Inch 8 Ohm Anti-Magnetic HiFi Tweeter Wooden Enclosure Home Audio Woofer Multimedia Speakers (8Ω) : Electronics