HiFi Headphone Speakers/acoustics Top Ten Common Misunderstandings(I)

- Mar 12, 2021-

"A recording studio is an anechoic room"

This is a very common misunderstanding, especially for some people in the recording industry who think that the rooms with certain acoustic treatment such as recording studios/mixing rooms they usually use are anechoic rooms. But in fact, although the common recording studio has acoustic treatment, it only partially absorbs and diffuses the reflected sound, or just treats some reflected sound that is not conducive to the working position, especially the part of the early reflected sound that may cause sound staining.

However, in a real anechoic room, sound-absorbing materials are placed anywhere in the room, and any reflected sound is minimized to simulate the free field (if it is a semi-anechoic room, there are sound-absorbing materials on 5 sides). Moreover, the actual sound absorption coefficient and effect of the sound-absorbing materials used in the anechoic room, such as the common wedge, are also different from those used in the recording studio or listening room. And even in a fully anechoic room, there is a lowTherefore, there is still a certain amount of reflected sound in common recording studios, and there is also a certain amount of late reflection sound that is reverberation. 

Therefore, there is no playback type similar to the reflection of the speaker system in the playback process of headphones, and even the restoration of reverberation is incomplete.-frequency cutoff frequency.


"People have two ears, so the stereo is more HiFi"

This is basically a false statement that can be seen everywhere.


Humans have two ears, so only one person can sing in a band + a total of two sound sources for an instrument to listen to? People have two eyes, so two screens are needed to watch TV? Only two people can play in the game? Humans have ten fingers, so the phone should have ten buttons?


This is actually something irrelevant.


In fact, if you want to play back a band consisting of 1 singer + 4 instruments, it is better to use 5 speakers, each speaker is placed at the position and height of the corresponding instrument and musician, and 5 sound sources can be simulated to get Better sound field effect.


In addition, the high-quality multi-channel system has the real sound image brought by the center channel, and the sky channel effectively restores the sound source and reflected sound in the three-dimensional space. Although the stereo sound system can achieve the sound image close to the real sound image through recording and speaker positioning, the sound image drift, sound image positioning change, and sound image focus caused by the dynamic factors of the human head are the congenital defects of the stereo speaker system. In other words, it is difficult to make up. The center speaker can effectively and better restore the human voice and image, with accurate positioning and no drift in sound.