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Yes I also think that if you can use strobe light and have the possibility to adjust the strobe frequency you don't even need a subwoofer, but for the proper "matrix-like" effect a lot of "frames per second" are needed and the camera gives certainly nicer result. In my opinion his setup was really quite optimal for what he presented.

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See my comment above. You actually need the sound to create vibrations in the stream of water that breaks it up into drops. The coolest thing is that there really are drops here, it's not an optical illusion.

I'm not quite sure I'm following you. You don't need the sound to break the water into drops. You can do it without the sound by just adjusting the flow rate. I've done this.

Are you just saying that by using sound, you can break up an even faster stream, one that would ordinarily be too fast to break up on its own?

With sound, you can break the stream into the same pattern of drop every time

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