1   Sound headphones
Evaluation of the headset can be used to measure some of the methods speakers, but headphones and speakers to listen to a different sense, the speaker issued by the attenuation of sound in air, the occurrence of interference, and the interaction of human head and ears, the headset directly into the ear sound . The quality Dr Dre Beatsof the sound headphones than its technical performance is more important, the shape of the head and ears are different, a pair of headphones to listen to different people have different sense, it is recommended only as a reference, have the opportunity to personally listen to . What is a high-fidelity headphones? IEC581-10 International Electrotechnical Commission recommendedBeats Headphones the document the main properties of high-fidelity headphones are: the frequency range of not less than 50Hz-12500Hz; typical error of plus or minus the allowable frequency response 3dB; frequency response of the slope does not exceed one for every octave 9dB; in the Dr Dre Headphones250Hz-800Hz or so units in the same octave bandwidth difference between the average sound pressure level of not more than 2dB; 100Hz-5000Hz range, sound pressure level of 94dB, the harmonic distortion of less than 1%, 100db does not exceed 3 %; headphone frequency response between the 2KHz-5KHz declined to allow to improve the transparency and sense of space. Folding headphones
Headphones greatest advantage relative to the speaker in theghd details, the actual headphones to listen to a good voice should be clear, detailed, no smell distortion; low dive and clear, be effectively controlled; the band to smooth flat, high frequency, however bright or too dark. For any pair of headphones, not tri-band are very perfect, smooth and natural connection between them is the most important. If the wireless / cordless headphones, the background noise to as small as possible.
http://www.thekeyshop.it/cafe/index.php?action=profile;u=12385
http://www.sportgiornali.it/smf/index.php?action=profile;u=1179
http://www.gamerland.de/index.php?action=profile;u=238649