Other voodoo babble from the pages of Stereophile et al. I swear that none of it is made up.

1. Put a brick on you amplifier to dampen vibration. Not just any brick, mind you, but an expensive one from VPI.
2. Put your equipment rack on tiptoes. This also reduces vibration and improves sound. We're not talking turntables either.
3. Clean your contacts with Brand X contact cleaner for better sound. By that I mean you will get better sound than by using Brand Y of contact cleaner.
4. Preamp A has more "air" than preamp B, some genuius said, listening to the two units six months apart. What a memory!
5. Purchase this special clock that has been "bombarded" with electrons, pixie dust, or whatever. Once plugged in, it will properly align the electrons in your house's AC line and VASTLY improve your audio system's sound quality. By the way, the clock came from Radio Shack and cost $20 - $30. After bombardment, it was more like $450.
6. Mobile Fidelty Sound Labs, whose re-mastering skills have created excellent recordings, came out with gold-plated CDs some years back and insisted that gold sounded better than aluminum. Yep, those 1s and 0s really care what kind of metal on which they exist. The FTC took umbrage at that little advertising slogan and put a stop to it. Yes, gold will last longer than aluminum - assuming you store your CDs outside without a case.
7. A young salesman in a nationally-known Chicago hifi store showed me a headphone amp/volume control the store had built and were selling for $350. It was powered by a 9-volt battery, but he warned me to use Brand A battery because it sounds SO much better than Brand B's battery. He never suggested that Brand B couldn't deliver 9 volts under load conditions, just that it sounded worse. You gotta admit the kid was good. He could hear DC.

Remember, these are all things that so-called self-professed "experts" have insisted made significant improvements, sometimes shocking them or sucking the breath from their lungs. I am not exaggerating those claims. Sadly, they also have powerful influence. That they have any at all is a disgrace.