if you happen to be listening to music or a conference call through the speaker on your iPhone and need it a little louder, you can just find a pint-size glass, put the iPhone in there, and voila, simple iPhone echo chamber. I'm surprised at both how easy this is and how well it works, but it does. Very impressive.
Source:
http://www.unplggd.com/unplggd/diy-proj ... ker-105736
We're a little embarrassed that we never thought of this until we just read about it. It's such an easy solution if you're in need of a speaker and just don't have a real one handy.
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