Step 4: Homemade speakers

Now you must make the speakers. Easy? Sure it is. Just simply make two narrow cones from paper, about one to two inches long (depending on box size) and tape them. Tape your headphones to the open narrow ends and then tape the two short soccer cones to the wide end of the cones, kind of like in the diagram below.
The two 4 ohm speakers should be two 8 ohm types because when they are connected in parallel, the impedance (resistance) is halved, so if you did connect this up to a 4 ohm output of an ampilfier, it would more than likely blow the amplifier IC (because the two 4 ohm speakers together are 2 ohms).

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