Technically, a weight on top of AV equipment's cases will change the resonant properties of the chassis but that does not produce audible effects unless it's on the speaker cone. The author considers this and dismisses the possibility because “rocks not heavy enough”.

Also, a sufficiently large rock will affect the performance of any Hi-Fi equipment.

Sometimes I think the whole industry of audiophile is just a bunch of baloney. Reminds of chifi IEM the KZ ZEX pro or something where people were praising for the improve sound and more drivers. Turns out only 1 driver is used and the rest are just there to justify increase in the price. It being no different than their cheaper version.

That's not untrue though... Putting rocks on your sound system could make the rocks vibrate against it and sound like utter shit.