Eco Amp

Although this example may not be a specific working speaker including electronics, this is a great way to amplify sound. Made specifically for an iPhone, it is limited to what it can be used for, however, there are no electronics or wires necessary.

"This is about as simple as it gets: It’s just a paper cone that fits over the bottom of the iPhone. In fact, it comes in a flat pack, and you fold it yourself, which adds the benefit of cheaper shipping and easier portability. But you might be surprised just how much this low-tech gadget accessory amplifies the sound."

This is an instructional video displaying how to make the speaker once bought. It then shows how much it is able to amplify the sound.

webecoist (2013). Eco Amp. Retrieved from http://webecoist.momtastic.com/2012/06/06/simple-recycled-paper-speakers-amplify-your-iphone/.