If you want a box with two tweeters and a woofer for some really legit sound, here's a design from a superstar of the DIY speaker design world: https://sites.g

If you want a box with two tweeters and a woofer for some really legit sound, here's a design from a superstar of the DIY speaker design world: https://sites.google.com/site/undefinition/isetta https://sites.google.com/site/undefinition/isetta He mostly just lays out the speaker and crossover design; but as he mentions a search for "TPA3116 2.1 amp" will give you lots of results on Amazon, AliExpress, and Parts Express. PE's forums are good, lots of people have tackled similar projects: http://techtalk.parts-express.com/forum http://techtalk.parts-express.com/forum For anybody else interested in this hobby, there are lots of fantastic kits out there, primarily for bookshelf/tower speakers and subwoofers. https://www.diysoundgroup.com https://www.diysoundgroup.com https://www.parts-express.com/cat/speaker-kits/286 https://www.parts-express.com/cat/speaker-kits/286 The product page for the C-Notes (a fantastic value at $100/pair!) kit has a build video which gives you a great idea of the process and the tools you'll need. Process is similar for any flat-pack kit. https://www.parts-express.com/c-note-mt-bookshelf-speaker-kit-pair-with-knock-down-cabinets--300-7140 https://www.parts-express.com/c-note-mt-bookshelf-speaker-ki... Of course you can also go as far down the DIY hole as you like, designing your own electronics and selecting drivers, etc.