Originally Posted by bellicose
Right, but I don't think it is as easy as that. Where do they get the freq from, how do the emit it, anything more special than a hose over a speak with an ipod hooked up to it?
Well to get that kind of movement, you would want a subwoofer with a decent amount of throw. As for the frequency generator you can use this. Online Tone Generator - Free, Simple and Easy to Use.
Just run your computer into a big amp and sub.
Might be easier to use a strobe and a dripping hose. Using strobe light to make water drops fall in slow motion