Stereo enthusiasts always discriminate against the performance of multi-channel systems during music playback. Let us give an example for analysis.
A set of 50,000 yuan stereo Hi-Fi system PK set of 50,000 yuan 5.1 channel home theater audio system.
The stereo system is relatively simple: 2 speakers, 1 CD player, 1 amplifier, a total of 4 devices plus some wires.
The home theater audio system has more equipment, 6 speakers, 1 AV amplifier, 1 Blu-ray player, a total of 8 devices plus some wires.
Arithmetic questions everyone should do:
The average price of the equipment in the stereo system = 50000/4 = 12,500 yuan (excluding the wire)
The average price of home theater equipment = 50000/8 = 6250 yuan (excluding wire)
If the influence of factors such as branding is taken, the quality of cinema equipment should not be as good as that of stereo equipment.
Stereo products have relatively simple electronic circuits and few components. On the basis of high price, stereo manufacturers can use very good audio components. Most of the ordinary cinema products are large-scale mass production products, complex electronic circuits, and a wide range of components (video processing + multi-channel audio), but also costly expensive Dolby/DTS/THX/SONY Blu-ray patent fees (amplifiers) And Blu-ray machines have to pay), you think, can AV manufacturers use high-quality audio components? If every resistor and capacitor is inferior, the divider and the Speaker unit are a few more faults, so if they accumulate, the difference is far. This is still a 5.1 system, if it is the most popular 7.1 system now? So isn't it worse?
In addition, when playing music, generally everyone will take the CD to compare. The CD is recorded in two channels, which is naturally the most accurate when the two channels are restored. If you use the AV amplifier's Pro Logic II or Pro Logic IIx to convert to 5.1 or 7.1 channels to listen, the accuracy of the restore is definitely worse.
Dolby Pro Logic II or Pro Logic IIx is a matrix decoding circuit that automatically detects the level and phase of the left and right input signals. Signals of the same amplitude (such as the singer's voice) are distributed to the center (music). In the mode, the distribution ratio can be adjusted. The inverted signal (such as the effect sound and reverb sound added during recording) is distributed to the surround. The actual signal distribution is a bit more complicated, but the general principle is this. This automatic steering distribution system revitalizes the two-channel signal playback, but the original signal is not recorded in multi-channel mode after all, and any additional processing may result in listening to some stereo music programs. Not quite the same as the original recording, plus the debugging of the 5.1/7.1 audio system is relatively complicated, so the overall playback effect may be even worse, so you can understand why many stereo enthusiasts do not like to use multiple sounds. Channel mode to listen to stereo music. Welcome to China Home Theater Decoration Network
However, even if the AV amplifier is set to 2.0 pass-through (turn off the subwoofer), or 2.1 mode (turn on the subwoofer), the difference in the quality of the amplifier audio component and the speaker unit will still cause the multi-channel system to play the two-channel music. Not a two-channel system like the price.
But when you look back, think about this PK is a platform based on fairness and justice? If you really want PK sound quality, I think that the total value of the 5.1/7.1 system should be at least 150,000 yuan (everyone uses the same series of products in the same factory, the audio components of the electronic products are basically the same quality), and the program should be played. It is a stereo version and a multi-channel version of the same program. Such a PK is considered to be fair.
Can the multi-channel system perform better than traditional stereo systems when playing music? If so, what is the main aspect?
Having said that, we have to go back to the origin of the fever - Hi-Fi, the full name of the English "Hi-Fidelity", Chinese translation is generally high fidelity. So what is the meaning of high fidelity? What is the high fidelity? From the perspective of music reproduction and playback, it is divided into the following two cases:
1) The feeling of listening to music at home is basically the same as listening to the concert.
2) The feeling of listening to music at home is basically the same as that of the recording engineer who recorded this CD.
Is the first situation possible? Unfortunately, it is completely impossible, and it is very difficult to approach. why?
Concert live performances (such as the symphony orchestra playing in the concert hall) have the following characteristics (taken from Dr. Floyd Toole's book):
1) The sound source is multi-directional (when the violin is playing a certain frequency of sound, the sound wave radiation is actually vertical upwards, many people don't know?), the sound waves radiate in all directions, most of the sound sources Are far from the audience. Please take a look at the picture below. You can see that when the violin is playing different melody, the radiation angle of the sound waves is very inconsistent, forming a three-dimensional 3D sound field before and after. Your family's speakers, even if they are 100 million yuan, can they produce vertical high-frequency when playing violin? Even if some speakers have a high-frequency "mushroom head" installed on the top, can your speakers radiate sound waves of different frequencies at a specified angle?
2) The perception of tone, space and envelopment generated by room reflection is the main way for listeners to feel the music (meaning that the reflected sound dominates)
The other three features are omitted here. Interested enthusiasts can check the relevant information themselves.
The key point mentioned by the Ph.D. is that behind the band in the concert hall, there is usually a large reflecting plate. This large reflecting plate mixes the sounds of the band and then pushes them to the performers and the first few. Row of spectators. The 3D sound field formed by this reflection is extremely complicated, and the two strong directional speakers used in the home are completely unable to restore the sound field effect of the appearing field. The use of multiple speakers combined with multi-channel recording soundtracks does not restore the complex 3D sound field, but the addition of center and surround channels enhances the perception of the audience's tone, sense of space and surround. From this perspective, multichannel systems are superior to stereo systems.
Is traditional stereo listening paying attention to the "phantom image" effect? That is to say, the person sitting in the middle of the two horns can hear the singer's sound image positioning just in front of you. However, if there is a dedicated center speaker, the positioning of the middle sound image does not drift, who cares about the phantom effect that disappears at that time? Everyone has not forgotten that, decades ago, scientists wanted to use three speakers to play the sound. In addition, the surround channel can play the ambient sound, which greatly enhances the sense of envelopment and presence. Also, 5.1 recordings are also equipped with LFE low-frequency effects channels, and the potential and peak reserves at low frequencies also exceed stereo recording!
So why is it not good to play multi-channel music in my home theater system?
A: Several possible factors - acoustic environment, equipment placement, seat position, equipment quality, commissioning, recording program quality. All of these links that may affect the sound quality will be analyzed in the following chapters, and then the fans can clearly know where the problem of their system is, and then prescribe the right medicine.
MAX Tip 1: The sound quality is not good, the first thing that comes to mind is definitely not to replace the equipment. Many times, your equipment is good enough!
Here the lens flashed back to the 5 million fever who appeared in the first chapter. He chatted with him at the time. He said that I have played JBL K2-9800 long ago, and that's it. Today, I really want to travel through time and space, and go back and tell him, "Big Brother, K2-9800 is a peak that is hard to transcend until today. In your huge space, K2-9800 is better than you from now on. It’s a lot better for me to call my name, it’s weird, and the price is expensive!†“You’re the right stuff, it might be more appropriate to put it in your 30 square meter study.â€
Ok, let's take a look at point 2. Unfortunately, whether it's a multi-channel system or a stereo system, you can't be sure if the CD effect you've heard is the same as when you recorded it. A scientist tested 250 stereo studios around the world and tested the far-field frequency response curve of the monitor speakers at the position of the sound engineer. You can look at the picture below, the difference is great, especially in the low frequency area (equipment debugging and room low frequency standing wave will cause similar problems). These studios use similar or similar professional recording equipment.
Imagine if the sound engineer could not hear the low frequency of a certain band (such as the bottom curve) while recording, in order to achieve sufficient listening loudness, he would have to record more low frequencies when recording. Then when you restore this CD in your home, you think the low frequency is very "hypertrophic", then it may not be your equipment or debugging problems? ?
When THX set the THX Music mode a few years ago, it tried to collaborate with the music recording industry to seek standardization. Later, it found that the industry had no standards at all, so it gave up the plan.
A small experiment can find that the music recording industry is seriously lacking in standards. For example, if you play different CDs, in order to achieve satisfactory listening loudness, is the volume position of the amplifier often need to be adjusted? However, if you play several Dolby Digital tracks continuously, you will find that the master volume is usually in the same position. This experiment shows that the recording reference level of CD is different for every company, there is no standard at all! The sound of loud noise is entirely determined by the audience.
When did you see that stereo enthusiasts used a Radio Shack sound pressure meter to calibrate the sound level of a stereo system? Even with a test instrument, how many decibels do you have to adjust the volume to the standard? The AV enthusiasts who have just entered the line know that the pink noise in the AV amplifier is used to calibrate the 75dBc movie sound level.
In foreign countries, many manufacturers of stereo Hi-Fi devices tend to use CDs from well-known large companies such as Telarc, EMI, etc. when demonstrating equipment. Who knows the CD from a small company?
However, the film industry has standards! As long as the funds are strong enough, when you build the audio-visual room, you can strictly observe the professional and technical indicators, and you can hear the same effect as Spielberg heard.
The camera returned to Guangzhou many years ago. In Haiyin Electric City, the author accompanied the first THX training instructor, Mr. John Dahl, to visit the store and experience the actual level of Chinese home theater. We came to a very high-end showroom, and the equipment was very valuable. The owner was happy to broadcast a popular "Cars" at the time. The author asked the foreigner's feelings, the old gentleman said: "The demonstration effect is really outrageous, and it is completely incomparable with the original effect. When I recorded this clip, I sat next to the sound engineer, when the car engine suddenly roared. At that time, I almost fell off the stool. Today, I don’t feel this way!". Vaguely remember, the price of the system is at least 800,000.
chapter summary:
1. In fact, I am not opposed to stereo music fever. Listening to music is originally a matter of cultivating people's sentiments. It should be worthy of advocating. Zhou, a celebrity in the IT industry, often encourages wealthy friends around to buy audio equipment to listen to music at home. I think this is very good. It is better than singing a nightclub and singing K. However, when this culture becomes a terrible "vionid", it is probably not good for the entire industry.
2. It is often said that “changing a line of a certain brand, the low-frequency sound quality will immediately be reborn.†“Big Brother, your frequency response has a super valley at 38Hz. You can’t basically hear the low frequency near that band. You change The root line, how does the low-frequency sound quality be reborn? Isn't that magical line intelligently detecting the big valley at 38Hz, and then using the magic to push it back?
3. The stereo fever audio industry will continue to exist, and existence is reasonable. There is market demand. No matter how big the impact of this article, from now on in the next 20 years, there will still be many people who spend a lot of money to buy brand-name wires, speakers and other fever products. Even in the US market where the custom installation industry is booming, the stereo fever industry still has its market and followers.
4. What I want to advocate is to pursue the perfect sound quality in my dreams in a more scientific and realistic way, whether it is stereo Hi-Fi or multi-channel system. The rising pursuit of quality by consumers is the driving force behind the development of the entire audio-visual industry.
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