Strictly speaking, headphone is a larger pronunciation, and it is a required listening device that worn on the head, which is not used by the vast majority of Walkman earplugs. According to the transducer principle, headphones can be divided into two broad categories: electric type (dynamic type) and capacitance type (electrostatic type). The principle of electrodynamic type is making the electric current pass through the current loop in magnetic field, to make the diaphragm pronounce. The features are the high sensitivity, can withstand higher power, stable sound quality and relatively simple structure. While in the coilless electrostatic headphones the diaphragm is usually used as movable electrode. As the diaphragm meets the electronic signals, the signal's polarity will change and thereby produces vibaration of attraction and repulsion in electronic poles. In this way, the sound is created. They've got a wider frequency range, and sound excellent, but they are complex and expensive.The Merits and Misunderstanding of Bose Headphones

• Headphones are good? First, pure sound true.

The headphones sound unit does not require large electric power, which is usually no more than 0.2W. Therefore, the signal from the audio does not need to go through an amplification of the circuit while maintaining a genuine sound. Because of the application of high-tech materials, currently it is not difficult to achieve full-range regeneration. The frequency response indicators of the slightly better headphones are better than the 20-20KHZ, and some high-level ones are up to 10-30KHZ, while the distortion degree is below 0.2%, which is difficult to achieve as for the vast majority of sound systems. Owing to the light quality of headphone's diaphragms, the transient response is very good with a strong control capacity. Unlike other speakers, which will reduce the sound quality of replay as a result of the influence of the piston, therefore, headphones have high resolving ability, wide dynamic range, and pure voice.How to Tutorials

• It is rich in sense of space. The feeling sound field of headphone pivots forward as sphere around head, while the sound field of sound system extends in depth before the listeners.

So when wearing headphones is just like sitting in the right middle in the front of the concert hall, almost climbing to the position of the conductor, with the whole body immersing in music. Such feeling can be extraordinary!

• Accurate sense of the square. Headset is only one pronunciation points, which can accurately restore a sound engineer for various musical instruments carried out by stereo audio orientation treatment, the band's sound in different directions out of the handling of full representation.

While it is hard for sound system to do it, and as we know that after we put the aucoustics on certain position, and then you will have fixed listening position, that is the headphone can walk causually. Waht a nice feeling!

There is a technical indicator you should pay special attention to when purchasing headphones, which is its impedance. Usually, the impedance for middle and low - level headphones is 30 - 50 Ohm, which can directly insert the players and other devices, such as: VCD, LD, CD, DVD, CARD, radios and so on. The dynamic impedance of high-end headphones is more than 300 OHM, which requires a dedicated headphone amplifier, such as: HD-580, the impedance of HD-600 is 300 OHM.

With my above introduction, does your mind disturbed? Action is better than hesitation, go at once and buy one. You even can not believe that the sound quality has a big improvement after you change the headphones of your Walkman.