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I designed and made a small 3D printed folded horn for my iPhone 5. It worked really well. You need a phone where the speaker actually plays out the holes in the bottom for it to be effective.
Edit: here’s one of them. I made a bigger one with more flare too.
Edit 2: good increase in volume, but don’t expect lots of bass. Small horns like this tend to just maximise the sound you’ve already got and aim it all forwards.
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Jonny69
Does anyone have a passive speaker for their phone? This kind of thing
Do they make a noticeable increase in volume?