Sennheiser's compact CX300 headphones offer portability and compatibility with mobile audio devices. The headphones provide relatively high sensitivity and low impedance, making them easy for portable music players to power.
Size
The small, lightweight design of these headphones makes them easy to wear and carry. The pair of ear buds and attached cable only weigh 4 grams total, according to Macworld. PCMag reports that the headphone cable attaches to players via a 3.5-millimeter plug.
Frequency Range
The CX300 can reproduce audio frequencies from 18 to 21,000 hertz. This allows the headphones to produce sounds over the entire range of human hearing, which the Music Theory and Composition website lists as 20 to 20,000 hertz.
Efficiency
The CX300's 16-ohm impedance gives the headphones enough power efficiency to deliver reasonable volume on portable players at less than maximum volume, while also sparing the player's battery, according to PCMag. These headphones reproduce sound with total harmonic distortion of 0.2 percent.
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