Obviously, the best test for sound quality is to listen to headphones first-hand. With that said, these specs can help add some context to your search.
Impedance and Sensitivity: Impedance and sensitivity go hand in hand and represent the amount of power required to achieve a certain volume level. Lower impedance and higher sensitivities are better with lower power devices such as MP3 players or smartphones. The Jabra Sport Coach is one such headphone with a slightly lower than average impedance. As such, to avoid damage we do not recommend using it with an amp.
Frequency Response: The frequency response indicates the range of pitches the headphones can produce. Human hearing range is usually quoted at 20 Hz - 20kHz, with most music falling well within those bounds. With a closed operating principle and a solid low end frequency response, these headphones can handle a strong bass and would be great for listening to pop or rock music.
Diaphragm Size: The diaphragm size is not necessarily a good indicator of sound quality, but is a factor in how well the headphones can produce low bass or high treble pitches. The Jabra Sport Coach has one of the smallest diaphragms compared to other in-ear headphones, and would be best for treble heavy music.
Weight: Weight is simply a user preference and metric of portability. It does not indicate higher quality headphones as some brands add unnecessary weight to their models. With that said, at 16 grams the Jabra Sport Coach is average weight for in-ear headphones.
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