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The following text will mainly please audiophiles using the iPhone as a music player. I remember Steve Jobs boasting at a seminal Keynote in 2007 that the iPhone was also the best iPod ever made. I could hardly believe these words after trying one of the "Booster" equalizer presets on my then-purchased iPhone 3G with iOS 3.1.2.

Both Tremble booster (more treble) and Bass booster (more bass) caused one unpleasant ailment, namely the distortion of the sound of the songs being played. This was particularly evident with the second mentioned preset, which I consider to be one of the most important. The inability to adjust the equalizer in any way forced me and many other people who draw attention to it in various forums to use a different preset, but the emphasis on bass and treble was far from sufficient. That's why I prayed with the arrival of iOS 4 that Apple would allow editing or creating your own equalizer.

I didn't get one, yet Apple made a correction. The crux of the problem was that the EQ boosted individual frequencies above 0, as you can see in the image. This increase is unnatural and thus usually leads to unwanted modification of the sound, i.e. to distortion. You can achieve a similar effect, for example, if you increase the volume of a song or video above 100%, you will get a louder but lower quality sound.

Apple solved this problem easily. Instead of boosting specific frequencies, in the case of the Bass booster, the bass ones, it suppressed the others. As a result, the lower frequencies will remain at the zero value in the equalizer setting and the higher frequencies will move below it. This creates a completely natural change in frequency that no longer causes that unpleasant distortion. Correction after three years late, but still.

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