At the boundary of minimum audibility, perception of low frequencies and high frequencies requires a significant level boost as compared to the midrange frequencies. The shape of the minimum audibility curve tells us something about the frequency response of the ear at low sound pressure levels. Research characterizing the human hearing range generated an areal map of auditory response as shown in Figure 1. So, when you push it, what should the loudness control do? Let's begin answering that question with a look at the historical basis for the loudness control and why it should make an audio system “sound good.” Figure 1: Realm of human auditory response Equal Loudness for All Different people and different companies have different design philosophies toward functionality of the loudness control. Someone in Product Management pushed it, but it didn't do what it was supposed to do: make the system “sound good.” That launched an investigation into the real intent of the loudness control function and a bit of re-evaluation by those individuals designing audio products. Since the inclusion of much more audio support in our products, that loudness pushbutton finally crept into a prototype product. That pushbutton recently created considerable flurry here at Extron. All the while, my stereo system “sounded good.”įast-forward 30 years. I left it pushed ON because it made the system sound better, so I continued to concentrate on my video career. Thinking back, I really didn't care what it was for. OK, occasionally I would push it to the off position nope, sounded better on. I decided the audio sounded better so I left it pushed in never changed it. The first really decent stereo audio system I owned had a pushbutton on the front panel called “loudness.” I pushed it.
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