Under what circumstances should the headphones be equipped w

Under what circumstances should the headphones be equipped with power amplifiers?
 
There are three kinds of ear power amplifier. One is the sound source used. For example, there is no earphone output jack on the CD/DVD machine. At this time, a headphone power amplifier can be equipped to connect the audio input jack of the power amplifier with two signal lines from the audio line output (LINE OUT) of the CD/DVD machine.
 
In the second case, if the low sensitivity and high impedance headphones can not be pushed by the existing sound sources such as Walkman, then the headphone power amplifier should also be selected.
 
The third case is medium-to-high-end headphones. Using the existing headphone jacks to launch such headphones can not give full play to the potential of headphones. Adding a headphone power amplifier can further improve the sound quality. In this case, we should consider adding a high-quality Headphone Power amplifier.
 
How to choose and purchase the headphone power amplifier of electronic tube headphone, goods transistor and Headphone Power amplifier?
 
At present, the power amplifier of the electronic tube headphones in the market uses the negative output to do the final power amplifier. This type of circuit structure should be said to be very reasonable. Therefore, it is adopted by most manufacturers. However, the output impedance of this circuit is high, and it can only be equipped with headphones of more than 200 or 300 Euros, and the higher the impedance, the smaller the distortion.
 
The OTL circuit is used in the final stage of the power amplifier of the transistor headphone. The requirement of impedance is not strict. The lower the impedance is, the higher the output current is, and the higher the power is. Therefore, the transistor power amplifier has high, medium and low resistance, but it is better to push medium and low impedance headphones.

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