Originally Posted by goober
You can get all the parts for the speaker box at parts express.If you want it loud but compact you can pick up some fullrange speakers about 3 inch or four inch,an amp module and either use a sealed lead acid battery or use double a batteries. If you need any help pm me i even have some spare parts laying around just pay for shipping
I've been looking at some builds on instructables. I have a 12v lead acid battery for motorcycle. Some of the builds used rechargeable r/c car battery packs.