Equipped with amplifier condition There are three situations for ear amplifier. One is the sound source used. For example, there is no headphone output jack on the CD/DVD machine.
The second case is, low sensitivity, high impedance earphone, with the existing sound source such as the walkman can not push, then also want to choose earphone amplifier.
The third case is the headset. The current headphone jack can't realize the potential of this kind of headset, and adding a headphone amplifier can further improve the sound quality. In this case, we should consider adding a high-quality headphone amplifier.
Buy tips Most of the electronic tube earphone amplifiers on the market use negative output to do the final stage amplifier, this type of circuit structure should be said to be very reasonable. Therefore, many manufacturers adopt. However, the high output impedance of this circuit can only be equipped with the earphone above 200 or 300 ohms, and the higher the impedance, the less distortion.
The final stage of power amplifier of transistor earphone adopts OTL circuit, which does not have strict requirements on impedance, and the lower the impedance, the higher the output current and the higher the power. Therefore, the power amplifier of the transistor is high, medium and low resistance.
Sound characteristics People are probably more familiar with eating than headphones, so let's start with eating. The taste of sichuan is spicy, while the taste of guangdong is mild and fresh. What do these three taste good? I'm afraid different people have different opinions about this. The same goes for headphones. European earphones such as bayya, sennheiser and AKG generally sound similar, real, clear and light like water. American earphones such as gauss, Alice and Goethe make people feel that the voice has humanity and vitality. Japan headset has the aesthetic characteristics of the east, voice is beautiful, warm voice, high low frequency extension well, someone may sound you / 5 a what do you like music, what kind of headphones, you are young or middle-aged people, what kind of personality, hobbies, your own decision, tell from the sound characteristics of the above three types only have different characteristics, no good.
Maintain
When we get a headset, we're going to start with faint praise, and I'm sure we'll know why. We can use it after commencing, but is everything ok once commencing? The answer is, some of the quality of the headset itself is good, is because we are not careful in the use of our beloved headset premature death! Below on the process I often see in the headphones, to give some maintenance advice!
1. Don't wear headphones while you sleep. Most people can't stay still for a long time. The headphone cord is either wrapped around the neck or twisted together like a twist. Some big earphones even have the shell broken. The first beam of 100, 200 is also a relatively fragile place! If some friends say that I can't sleep when I don't listen to the music, then hanging the earphone is over your head, with a rubber band to tie the earphone cable at the head of the bed. When you fall asleep, the headphone will be "pulled" down, no matter you will roll over will not press down! The advantage of using a rubber band is that it ACTS as a buffer when pulling the headset!
2. After using the headset, wipe the sweat off the headset line. These things that the human body secretes, which contain oil and so on, are invisible killers of wire, such as the e2c at the bend of the ear. Over time, the wire ages, leading to cracks and fractures.
3. Don't smoke when using headphones. Anyone who is not careful, whether the earphone case, the line is hot, hundreds of thousands of ocean you can not feel pain??? In addition, the soot will get into the earphone shell and stick on the film.
4. Turn down the volume before using. If the volume of your output device is too high, it will not only shake the ears, but also shake the diaphragm. The heavy person burns the sound circle of the earphone.
5. Keep the headphones away from strong magnets. The magnetic properties of the unit will drop, and over time the sensitivity will drop!
6. Keep headphones away from humidity. The welding pad in the earphone unit will rust, and the resistance will increase, and your earphone will be deflected.
7. Plug part. Some friends like to put mp3 or something in the pocket, plug out the part is easy to fold, will break over time.
8. Don't dismantle. So curious, I opened it. Some earphones are hard to detach. The mx500 can't be opened by any means, even if you break it by 80%. The smaller 2 might break the shell, or get a deviation, or 888 or 808.
9. Don't use it outside in winter. Cold winter, wire more rigid, brittle, excessive bending easy to break wire. Do not heat the headphone cable at this time, the high temperature will accelerate the aging wire.
10. Stay away from chemicals. The paint on the earphone case dissolves in organic chemicals and doesn't look good.