If you've found your speakers to be lacking in the visuals department, this is just the mod for you. Using 3" PVC, you can turn your speakers into light-up glow rods that pulse to the beat of your music.
You'll need some electrical skills and experience soldering to get this one together, but otherwise it's not all that complicated. The main components you are going to need are speaker drivers, PVC pipes, LEDs, and the necessary cabling for those devices.
The device works best with higher volumes; the louder the music, the more intense of a "pulse" it will give off.
Read the full tutorial here to make a pair of your own "Sound-O-Light" speakers, or watch it in action below.