Boombox v3

This boombox based on cheap parts and had a 3D printed body.

Part list:
* [MP3 module with bluetooth](http://s.click.aliexpress.com/e/cT4xT2PQ)
* [10 W 4 Ohm 52 mm speakers](http://s.click.aliexpress.com/e/Y3a4ohS)
* [PAM8610 amplifier](http://s.click.aliexpress.com/e/byJvI6K8)
* [2S BMS plate](http://s.click.aliexpress.com/e/bdziggha)
* [4x18650 batteries](http://s.click.aliexpress.com/e/yvw8MfA)
* [2xBattery holders 18650](http://s.click.aliexpress.com/e/b3hGueoC)
* [Passive speakers 62 mm](http://s.click.aliexpress.com/e/b0OctTgy)

I've made audio level and battery indicators by myself but you can use complete cheap modules like this:
[2S Battery indicator](http://s.click.aliexpress.com/e/cGaZhsXe)
[Audio level module](http://s.click.aliexpress.com/e/bKTmWeTQ)

Passive speakers works well only with a leakproof body. To prevent leakage you must glue speakers and all halls in the acoustic volumes with a silicone mastic or some resin glue.

18650 batteries con