Gold is one of the most durable value keepers in the world. Yet long ago, sneaky folks realized that gold could be mixed with less valuable metals to dilute its purity and create something that may have appeared similar, but wasn't the same. In some movie you've probably seen a pirate or some market vendor bite a gold coin to figure out its purity –that's because pure gold is relatively soft, and a bite could [roughly] indicate its purity.
Nowadays we use the carat measurement to determine gold' purity instead of our teeth, and although it might give them a bit less business, our dentists are probably thankful for it. 24 carats is the goldest gold you can get and if there's any other metal present it’s of such a negligible quantity that it’s not even worth mentioning.
In the world of digital audio – specifically when it comes to frequencies and EQing – we have something similar that we call Q. What is Q? The Quality factor. Yet aside from having a technical role in mixing the [very] occasional gold-certified record, what can an EQ possibly have to do with gold?
Read the rest here.