Mac Mini

Have you ever been working on a complex spreadsheet when the cat jumps off a chair onto the floor, and you look at the cells in your spreadsheet and all the values are totally messed up? No?? Me neither.

Remember, it's a computer, not a turntable. Unless you're extremely concerned about your Mini outputing "shaky" zero's and one's, I don't think you need to be too concerned about an isolation platform.
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I have Vibrapods under mine. Works fine.

Anything that spins, vibrates. Cat or no cat. Reduced vibration equals better sound.

For something inexpensive, try a bamboo cutting board (I like these), any of Herbie's Audio Labs footers (always a good deal), or the Vibrapods as mentioned. Even a foam mouse pad would work well. You could also try a cork floor tile, which would be another good material to dissipate energy.

I use Herbie's footers under mine. I actually have two iomega MiniMax hard drives under the Mini and each unit has the Herbie footers under it.

>>Anything that spins, vibrates. Cat or no cat. Reduced vibration equals better sound.

With all due respect, that's one of the silliest statements I have ever heard in regard to electronic media.