Passive iPhone amplifiers are a dime a dozen these days, but Will Rockwell’s Steampunk Victrola is something genuinely new and interesting. It consists of a trumpet bolted and soldered to an upside-down spittoon. The natural acoustics of the setup produce some impressively rich sounds with absolutely no electricity.
The most interesting part of this design is the Plexiglas “gate” on the bottom of the amplifier. It opens up via a small handle, allowing sound to come out of the top opening (the trumpet) as well as the bottom. The very cool iPhone accessory is meant for the iPhone 4S and will run you $400 through Rockwell’s Etsy shop.