Good Noise vs Bad Noise
You don’t have to know much about hi-fi in order to be aware that having unwanted noise in your hi-fi system is a bad thing. If there’s too much noise, you can’t hear the finer detail in the music. And even if you have only a little noise in your system, it can be intensely annoying. Recordings made using magnetic tape were renowned for having excessive noise, so much so that a term was coined specifically for the type of noise produced — tape hiss. It was present even on high-priced professional open-reel machines, but reached its peak nuisance value with the invention of the compact cassette. It was so intrusive that systems were developed to eliminate it, the most popular of which was developed by Ray Dolby and named…