The sound of steampunk
Looking like they were stripped from a World War I submarine, Ikyaudio's Steam Pipe Speakers (no longer available for purchase) appear to be made of steel. Actually, designer Eric Nelson started with plastic PVC plumbing pipes that he glued together and hand lacquered.
In addition to a 3-in. magnesium/aluminum alloy speaker that can reproduce audio from 80 to 20,000 hertz, each speaker has a small bass port housed in a 1.5-in. pipe that protrudes at a 45-degree angle. The speakers have triangular wooden bases and connection posts in the back to hook up to a computer or stereo.