Last updated 1 year ago
DIY Plans: Make Your Own Wooden iPhone Amplifier
Have you heard about the cup trick? You can amplify your built-in-iPhone-speaker's volume by resting it in a dry glass cup. It's called a "passive speaker," and it works kind of the same way that the hollow body of a guitar or violin helps to amplify the sound made by the strings. Of course, leaving your iPhone in a glass isn't the most gorgeous solution for amplifying sound without extra power.