In fact these graphs are typically provided by speaker and headphone

In fact these graphs are typically provided by

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to do so in later parts of this chapter. In fact, these graphs are typically provided by speaker and headphone manufacturers. Let‟s look at what we will call a teaching moment ( or “Why you should bu y real headphones, and not Beat-branded headphones ). Disclaimer: As a learning institution, we do not endorse or denounce any particular products or brands please take what follows as just an interesting example, and nothing more. For this example, consider two different types of headphones that we wish to compare: On the left is an older set of “Monster Beats Pro” headphones. On the right is a set of Beyerdynamic DT990 headphones, used for professional studio recording, which cost less than half the price.
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13 If one examines a graph of the frequency response of each type of headphone, it is possible to gain some insight into the type of sound produced. Here are the frequency response graphs (as an oversimplification, one could consider this for the headphones, although there is actually more going on here): Source: (Top): Monster Beats Pro, (Bottom): Beyerdynamic DT990 Pro
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14 One can draw some interesting conclusions from these graphs. In general, a flatter response is the most desirable this introduces the least change in the music you are listening to. One can immediately see that the DT990 headphones, being studio recording headphones, place heavy emphasis on not changing or influencing the sound you hear. The frequency response (red and green lines) remains nearly flat (a horizontal line) until around , with minimal peak and drop after. A typical problem with headphones is that bass response is difficult to produce. It is mechanically difficult for the physically small headphone speakers to produce bass (owing to long wavelengths requiring more diaphragm travel and larger speaker cones). This is compounded by the fact that human bodies experience bass through more than just direct hearing there is transmission through our skeletal structure and compression / reverberation when listening to large speakers. Thus, many people intuitively favor the „Beats‟ series, as one can see a heavy emphasis on bass (frequencies below roughly ). However, we possess other means to increase bass it is typically preferable to increase bass response through an equalizer, which (as we will see and design later) is essentially an adjustable series of filters. Through an equalizer, one can emphasize or de-emphasize a range or multiple ranges of frequencies. More importantly, one can do so with linearity and precision. By contrast, artificially increasing bass response directly at the speakers can lead to distortion of the original audio, compression (artificially induced loudness/bass which is known to damage speakers, amplifiers, and possibly hearing!), and generally poor audio quality.
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