Spiral Bass Horn
I've developed a spiral bass horn that has outstanding performance, and is also good looking. Feel free to enjoy the pictures, below.
Below: This is the measured performance of the spiral bass horn. The video moves upwards in frequency every 15 seconds. You'll notice by 23 hz the sine is no longer clipping and becomes more efficient. Also, at 23 hz, the output voltage measured slightly under 5 volts. The horn delivers 100 db at six feet--which translates to 106 db at three feet. That's outstanding performance!
Below: Here's a music video I captured with my iPhone. It's not professional grade, but does give a sense of the power generated by horns.
The completed prototype, below:
Acoustic performance with a Radian 2216 neo 15 inch woofer, below: