Incredibly cheap DIY speakers for your smartphones

This video shows us a cool and easy way of making speakers that amplify the sound of your smartphone built-in speakers.

Have in mind that you have to make the gaps in the plastic cups as precise as possible, and that the quality of the cups may influence the sound. Also, the painting roll has a better sound isolation than the paper roll.

In this other video you can see that a similar but poorly crafted DIY speaker system gives a pretty crappy sound.

Bonus tip: wood is the best material for loudspeakers. If you can find a way to use it, feel free to try. 😉