The Griffin AirCurve Dock is a nifty gadget that uses a coiled horn to increase the volume of your iPhone’s speaker. Griffin’s marketing claims that their passive device delivers “amazing amplification” and “you’ll swear there are full-sized speakers in there.” Meh. It does look like an interesting project for someone with a 3D printer. You could experiment with different passage and dock shapes. At least it gives us an excuse to post two massive DIY horns.
Above is “THE BIGGEST SUB HORN OF THE WORLD”, created by the guys at Royal Device. This massive subwoofer and horn is claimed to have bandwidth below 10Hz, and produce 100dB at only 1 Watt of input power. The sub construction is built under the listening room. The speakers (16 of them) are rated for a total power of 6400 watts.
The Kleinhorn is set more in reality. These Baltic birch horns are loaded with Lowther DX-55′s. The horns are about 11 feet long, and were built in sections to make it easy to modify the damping and so you could get them through a door. Our table saws are already itching for some action.