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.
wooden iphone speaker - Google Search
MONOCO XL is a mono amplifier which takes advantage by a wooden block act as an iPhone speaker.No cable, No electricity, only natural sound , The shape of the stand, get a comfortable use of touch screen of your IPhone possible.
Picture of The measurements
clever und hübsch - eine Holzbox für's Smartphone
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