Instructables

How to Build a Megaphone Bike Stereo

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Step 3: Remove Old Driver - Replace with new speaker

Remove the old megaphone driver - while it's suitable for projecting sound a log distance, it's not very nice for anything more than scratchy vocals yelling at misbehaving schoolchildren.

Replace with another speaker - I sourced mine from a derelict boom box.

Check that you can still play music - this is also a good time to mock up mounting locations.
 
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