Most young friends nowadays like to wear headphones. Here are some suggestions for the choice of headphones: I hope to use them as a reference when purchasing headphones.
1: frequency response range
Frequency response range, full name frequency response range, also called frequency characteristics. The human listening sound is actually the vibration of the tympanic membrane to the sound, and it is felt by the forced vibration (resonance). The theoretical maximum value of the hearing is in the range of 20 Hz to 20000 Hz. The lower one is called the infrasound wave, and the more is the tactile feeling, not the hearing.
In the IEC581-10 standard of the International Electrotechnical Commission, the frequency response range of high-fidelity headphones cannot be less than 50Hz-12500Hz, but the earphone products currently on the market generally have their own frequency response range of 20Hz~20000Hz. Why are so many different products, different units, this performance parameter will be the same? The frequency range that the human ear can recognize is exactly equal to 20Hz~20000Hz. Below this band of sound, kittens and puppies can pick up, but people can only be perceived by the body's touch; and higher than this band of sound, I am afraid that only bats can hear.
At present, many high-end earphones claim their own frequency response width from 20Hz to 20000Hz, and even more nominally 5Hz to 50000Hz. It is worth noting that this is caused by the difference in the standard of the defined frequency response width. The average manufacturer measures the frequency response width by 1/2 of the output amplitude, that is, the standard is -3dB (decibel). However, some products are measured by -lOdB (decibel number), which is equal to the normal value of 1 to 6 below the standard to measure, so the frequency response is greatly widened.
The frequency response range is important, but not as important as everyone thinks. When you buy headphones, there is no need to pay too much attention to this parameter, it can explain certain problems (the manufacturer relies on this to set the market positioning of the headset, the high-end products are better than the low-order is too normal), but can not explain all the problems, so as to determine The advantages and disadvantages of headphones and the criteria for choosing products are not advisable.
2: Impedance
Impedance is an abbreviation for headphone AC impedance for headphones. Different obstructive earphones are used in different occasions. On professional equipment such as mixers, high-impedance earphones are commonly used. Usually, the headphone impedance will be above 2000, which is to match the earphone jack of professional equipment. For a variety of portable Walkmans, such as CD, MD or MP3, low impedance headphones are typically used.
The most famous of the high-impedance headphones should be the 240 series of AKG listed in 2005, and the impedance of the K240M has reached 600Q. Why is a headset so high impedance? There are many different opinions, but the most likely one is: According to the current environment (basically tube amplifiers), the output impedance of the amplifier is high, so the damping coefficient is lower for systems with headphones (the larger the coefficient, the more Helps improve the power of the amplifier to control the unit). Under the premise that the circuit design does not have much room for improvement, the impedance of the earphone must be designed to be higher to improve the damping coefficient. Therefore, the low impedance is not fundamentally related to the quality of the headphones. The design is completely based on the environment of the front-end source. Nowadays, high-end headphones below 100Q are everywhere, and they are not necessarily professional.
Headphone impedance parameters can basically be said to be independent of the quality of the headphones. Although this parameter is important, it should be seen with your source device for reference. If you are using a transistor amp or MP3, mobile phone, etc., the low-impedance headphones should be theoretically better (not absolute, or depends on the actual situation, so listen to it). If you have a tube amp on hand, high-impedance headphones may have better control.
3: sensitivity
As important as impedance is sensitivity, often compares it with impedance as a parameter to compare the problem of earphone products and amps.
Sensitivity refers to the application of a certain input power to the earphone, and the sound pressure signal of the calf/b sub-network can be produced within a certain distance in front of the horn. That is to say, the magnitude of the input power required by the sound source in the case of the same intensity. When the user hears the same sound, the higher the sensitivity of the earphone, the less power the sound source needs to input.
Some profiteers say "the higher the sensitivity, the easier it is to drive the headset." Really? I am afraid that it may not be the case that the earphones are difficult to do well, and the speaker is a reason. Assuming that the impedance of the unit is constant, then everything is simple and sounds loud enough, even if it can be pushed. However, the impedance of the unit at different frequencies is not certain!
Although sensitivity is also an important reference indicator, the threshold for audio products is low and it is difficult to do well. At present, the more feasible method is to consider through multiple parameters; the other method is still listening to the truth. After all, the ear won't lie to you.
4: imported brands
Judging the quality of the product from the appearance is also feasible in some cases, but it has higher requirements for judgment. The better earphones have a smooth appearance, fine workmanship, and excellent hand feeling. There should be no rough feeling of using inferior plastic. In addition, the lead wire has a thick wire diameter and is soft and not hard. The plug is required to be finished without burrs and the coating is smooth and uniform.
In addition, it is recommended that you go to the regular business to buy, learn more experience after starting the product, because the big brand of headphones may not all be good, look at the evaluation article of the headset, look at the evaluation article to see the shortcomings, and the test environment, and Don't blindly look at the advantages, it's a good idea to be fully prepared and then buy.
When buying earplugs, try to bring yourself more usually, more familiar music, don't blindly believe in "salmon dishes. Although the sound of saliva is first-class, but it is specially landscaping, such as vocals are particularly round and resistant. Or low-frequency powerful, extremely impactful, which is easy to create an illusion, that this landscaping sound is the characteristics of this headset, thus covering some of the shortcomings of the headset; the main purpose of buying headphones for the Walkman is Listening to music, it's easier to understand the characteristics of your headphones with your familiar recordings, and it's easier to choose the headphones that suit you.
5: In-ear earplugs must be good
In-ear earphones can create your own music space outdoors, but is it really as good as some high-profile or pseudo-speakers?
The more typical saying is, "The earplug does not hurt the ear only related to the sound pressure value! The popular point is that the sound size l sounds louder and certainly hurts the ear." The ear earplugs isolate the noise, so the volume can be opened smaller than the non-ear earplugs for hearing. The damage is small."
When the in-ear earplugs isolate the sound waves from the outside, they also isolate the sound waves in the ear canal. The reason why the sound is loud is that the sound waves are mixed in the ear canal. Therefore, it is difficult to prove that the sound pressure value of the leaking non-ear earplugs when reaching the eardrum must be higher than that of the earplugs.
Although they have great practical value, excessive hype will also give people the illusion that earphones have inherent advantages over ordinary earplugs. In fact, the earplugs also have its inherent disadvantages. A large number of entry-level in-ear products have auscultation effect. When you go out, it is inevitable that you will encounter it when you go out. At this time, the sound of the wire friction is not very good.
This is not to say that the sound quality of the earphones or non-ear earphones is better, because the sound quality is not necessarily related to its structural form. The quality of the classic non-in-ear earphones is not worse than the current price of the earphones. The sound quality of the higher-end earphones is also due to its excellent overall design and good materials.
That whether to buy earplugs depends entirely on your needs, if you really want to isolate external disturbances (such as telephone plugging). Then in-ear earplugs are indeed very valuable to buy. Of course, one more thing to consider is the security issue. Assume that when crossing the road, the association will not hear the sound of the car whistling, or the hearing of the leader will not be heard at work, and the consequences are very serious.
6: selling is a work package, so the price is cheap
In all fairness, the work bags are not all defective, but also good, but you have to have a pair of eye-catching eyes to distinguish them. Whether you want to buy a work bag cheaply depends on whether you have the ability to distinguish.
The same factory products, there are real, there are also fake.
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