Headphones / Earphones
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Headphones are small speakers designed to hold close to users' ears. The device may use wired or wireless connections to connect themselves to a signal source such as an MP3 player, audio amplifier, mobile phone or CD player. Some LED TVs and DVD players also come with headphone jacks these days. All headphones are defined through their sensitivity and impedance. Sensitivity is the measure of a transducer output when driven with a specific reference input. Nowadays, headphones concentrate more on noise canceling. However, you may notice intermittent problems with the sound quality if both your headphones and the signal source have noise cancellation features.