High Performance Dr Dre Headphone

Headset system Speaker system has a lot of common places, from the perspective of the entire system to consider the problem, to beats by dre wireless seize the weakest link in order to use the smallest investment to get the maximum improvement. Many users use the source level is not high, in this premise, the role of the amp will be significantly reduced. The so-called clever and difficult to cook, in the previous post I stressed the importance of many sources, civilian sound card and Walkman and entry-level desktop CD gap is also great.

Sound card and Walkman beats headphones + amp with the mix for whatever reason, I think that can only be a temporary transition measures, the sound source is not on the overall effect of the grade will not be on the steps. People are less sensitive to the sound, the natural requirements of different equipment, we can not take a small part of the hearing is not sensitive to the standard to promote, this part of the people actually very happy, you can use very little cost to be satisfied, we do not Will discriminate against them, but not to their point of view as a standard to beats earphones look at HIFI equipment, in fact, so many people actually listening experience has told us the importance of the whole system placed in the system, it does not need any "golden ears" Without this experience or can not hear now, may wish to slowly develop, looking for opportunities to listen to better with the next effect, the sensitivity of listening can be gradually improved. Is that sentence, need to need to listen to the system, see headphones, desktop CD + amp even listen to the MX500 can hear even more than the direct use of the sound card has been significantly improved, but we never recommend to friends so With the system configuration is unreasonable, the same if you have a high-end headphones, and not with the amp, it is a waste of headset resources, there is no effective play, the system is also unreasonable. Not an ear can be applied to all headphones, ear to do 100% without distortion and sound is not possible, only as close as possible to this goal, the closer the cost of paying the higher, and the headset is not frequency Completely straight without distortion, which also has a different style of headphones, which in turn meet the different preferences of people, so under the premise of how to make the headphones full play out of his features and some make up for its shortcomings An important function. For example, A250, very good push, then the sound card is also very loud, but the high frequency is too wool, intolerable, I have done six DIY ear put the A250 test (see the essence version), SXT-1 with Better than the other ears, much better than the sound card. The fidelity of the amp is in the "magnification" under the premise of the fidelity, or not called the headset "amplifier", without this amplification, a lot of headphones in the "eat" conditions of work, it will affect its play. Not the ear to create the sound of the role of the amp is not "to improve the sound quality", but to allow the headset in the full drive to show its true sound. I said the sound card + HD600 is HD600 play 4 into the standard, with an entry-level CD + 1000 yuan level amp, there may be 8-9 into the level, think of 95%? The price will go somersault.

Although we all know that loss of sound loss of sound quality, but for what happened, not many people have to understand

Damage to music in ensuring a certain sound quality of the case and a significant reduction in the file size, is certainly in accordance with a law to carry out, if the casual deletion of information will certainly be very distorted. To understand the loss of music content, we need to first understand some of the ear hearing characteristics First of all, a brief introduction to the masking effect of masking masking effect can be classified into three kinds: absolute masking, time domain masking, frequency domain masking

1. Absolute masking

The auditory system of the human auditory system for the sound frequency signal from the range of 20Hz ~ 20kHz, in the frequency range of the sound signal, as long as the energy is large enough, can be captured by the human auditory system. For each frequency of the signal

, There is a corresponding auditory threshold. In the absence of any other noise interference conditions, a certain frequency of the signal energy is greater than its corresponding auditory threshold, then this signal can be heard.

The above argument may be more cumbersome, simple, that is, the sound must reach a minimum intensity, can be heard, did not reach the minimum intensity of the sound, people can not hear. Different frequency

The minimum intensity of the sound is different.

So, we can experiment with the minimum intensity of the different frequencies are tested out, and then painted on a map, you get the ear audible minimum loudness curve

2. Time domain masking

Time domain masking refers to the phenomenon that a strong energy signal can mask the audio signal that is weak or weak before or after or at the same time. The masking of the preceding sound signal is called the leading masking, and the subsequent masking of the signal beats earbuds is called hysteresis masking, and the masking of the emerging signal is called immediate masking.

The time of immediate masking is as long as the duration of the masking signal, whereas the pre-masking and hysteresis masking are immediate effects of masking in time. In the timeline, the more the two ends of the extension, the effect of the weaker degree.

According to common sense, after the emergence of the signal for the first appeared in the signal is no masking effect, but because of the human auditory system and brain reaction lag and the sound signal before and after the relevance of the lead mask will appear.

The effect of the pre-masking time is generally short, about 20ms, and the duration of the masking can last for 150ms.

3. Frequency domain masking

A strong tone will mask the weak tone at the same time as its sound, which is called frequency domain masking. Frequency domain masking is the immediate masking in time domain masking, but it is the study of the masking effect in the frequency domain.

For ease of understanding, here is an example. If a 1000Hz pure tone is 18dB higher than another 900Hz pure tone, then the 900Hz beats by dre studio sound will be masked by the 1000Hz sound, but if you want this 1000Hz pure tone to cover the distance of 1800Hz a pure tone, then 1000Hz tone It must be higher than the 1800Hz sound 45dB! The actual situation to hear the sound less encountered in this situation higher than 45dB, the frequency domain masking effect is mainly reflected in the nearby frequency.

It has been found that the masking threshold is a constant in a narrow frequency band centered on the frequency of the masking signal, which is called the critical band at the center of the signal bit. The bandwidth of the critical band changes with the change of the center frequency, and the masking effect also changes. This change is non-linear, and the non-linear relationship is inconvenient in research and expression. Researchers use an empirical formula to solve this problem, and the relationship between the masking curve and the critical band becomes a linear relationship. This formula is more complicated here do not discuss.

In fact, we understand the above three concepts, it is not difficult to imagine how the loss of music is "lossless" music to reduce and maintain a certain sound quality

Researchers combined the above three masking effects, coupled with a number of other factors, to establish a mathematical model, the human beats earphones auditory psychology model (Perceptual Model)

In the encoding process of MP3, the original lossless signal is calculated by using the auditory psychology model, and the signal that theoretically will be heard by the masking effect is left, leaving only those signals that will be heard. This process is "Lossy" process.

Damage to music "loss" is the above mentioned three will be masked out of the signal

Through the adjustment of the accuracy of the psychological model, you can filter out the signal to varying degrees, filter out the signal more, although the total information can reduce the amount of space, but will inevitably cause greater distortion.

In the encoding process of MP3, CBR (fixed bit rate), for example, provides a data flow (such as the common 320kbps), and then from the highest precision of the psychological model began to test, to produce a result, and then judge this The result of the data flow is more than the provisions of the flow, if more than, then replace a model for coding, filter out more signals to try to know that the data flow in line with the specified flow. MP3 code is so kept on try and error.

Personally think that as the most important thing to listen to headphones or can use it to accurately determine the sound. Sound field is also an important part, but the headset can not replace the speaker after the mixing of the acoustic conditions provided. No matter how good the headset mixed out of things or to get the speaker to confirm whether there is a phase of the problem, so I do not think too much to pursue the so-called headphones sound field, headphones is the primary task to do sound, not to do sound field. Which models are more outstanding see the answer to Kan Ouli. I choose another important factor in the headset is comfort, on the one hand is to wear, on the other hand is a sense beats by dre studio of hearing. Especially in the comfort of this point, to some extent I think than the headset on the sound of the reduction is also important, because when you know, accustomed to a headset after the frequency response characteristics (of course, the premise is that it will not be too outrageous), in the recording , The process of mixing you will consciously according to the characteristics of this headset for your recording or mixing to a specific circumvention or compensation. Bluntly, used to you can make do. But the comfort is that you absolutely can not adapt or make do. As a professional use of headphones with the general use of listening to music is different from the headphones, you listen to music up to one or two hours, but the work is to live a few hours, or even half a day is not impossible, so comfort is very important.

To say that the monitor, you have to say that HIFI really said: "monitor" the word is the equipment manufacturers invented their own "HIFI" word of the most powerful face no one we know that HIFI itself is "high fidelity" But this HIFI non-HIFI: Today's so-called "HIFI" has long been reduced beats headphones on sale to "seasoning": like your home out of the equipment Tomato flavor, my home out of the equipment barbecue taste, his home equipment beats headphones beef flavor ... ...

But from the recording beats earphones to the playback process, there will be a lot of opportunities for distortion, such as the quality of the recording pen microphone, recording pen recording data quality, recording pen placement, playback front end of the reduction force, front-end speaker that line The height of the impedance

In the audio equipment, many of the "metaphysical" link, there are always many are often mentioned. Whether it is a big speaker or a small headset, there is a ring, whether it is high fever players or entry white are concerned, that is, "wire problem." Although the ear headphones now have a "change, such as replacement," the argument, but more people are concerned about the wire or for the sound changes. In the discussion of the headset related forum, we can still see a lot of friends in the discussion of their own headset to bring the sound changes. Of course, there will be a lot of friends scoffed at it, to superficial theory to claim "for the line useless", that these friends who are dedicated to change the line are useless work. In fact, from the structure, the wire for the sound or will have a certain impact. Our common headset wire is made of copper or silver-plated copper wire, in the more advanced wire there are mixed techniques. Different materials and the preparation of the entire cable, shielding process, different processes will lead to different characteristics of the wire resistance and transmission characteristics, the final sound of course, is not the same. Give a relatively simple example to illustrate the different materials, the length of the actual line of the entire line of the impedance and filtering properties will have a "big and small" effect. At the same time, because most of the ear headphones are high sensitivity, low distortion of the speaker, so the purity of the wire, the crystallization rate of this weak current transmission of audio have a significant impact. If you use too thin wire, due to large internal resistance, will lead to more output power loss in the wire resistance. But the beats by dre sale use of coarser wire, the cost is also a problem. So the wire material selection and structure, in fact, is a knowledge.

Then it is not every so-called "upgrade line", are able to reasonably take into account the material and production process for the sound style of the impact. In the years of playing machine experience inside, the old bear also heard a lot of damage to the three lines of wire matching. They are beats by dre either the pursuit of one-sided link beats headphones on sale to enhance the sacrifice of the whole sound, or is not to enhance the sound, but let the sound become worse. May feel "for the line useless" friends, do have experienced a lot of these cases it Then the other point of view, some of the big brand manufacturers to provide their own official upgrade line, whether it will be the hard power of the headset itself to beats by dre enhance it? Yes, yes, the headset line on our body adaptation problem. My friend in the old iron to upgrade the official line after a period of time, the location of the ear appeared allergic swelling of the situation, but fortunately did not cause further impact. The official upgrade line will not only change the sound, but also on the human body have more intense "change" it? To this end, the old Baidu Baidu online whether there is the same type of situation, the results did not expect the old iron home other types of wire there are many people react to the existence of "allergy" problem.