On the stage, the singer or the musicians in the band listen to the accompaniment to sing, but the speakers on the stage 

are facing the audience, so the accompaniment that the singer hears is actually the accompaniment sound from the speakers 

on the stage, which travels to the last wall of the audience and bounces back. There is a delay of 1 or 2 seconds between the 

sound returning to the singer's ear and the accompaniment heard by the audience. This delay is closely related to the Angle 

of reflection, the length of reflection, the intensity of reflection, and the size of the room. So, if the singer listens to the return 

accompaniment and then sings, the audience hears the effect that the singer can't keep up with the rhythm!

     Therefore, in front of the stage, there will be several particularly large speakers, facing the singer, rather than the audience, 

the role of these speakers is to allow the accompaniment timely feedback to the singer's ear, so that the singer's singing voice 

and accompaniment together, even if it is integrated, there will be a certain delay, but people generally can not hear it!

     Sometimes the stage is very large, and the sound produced by the speakers at various points on the stage will have a small 

deviation at a certain point. When the point is fixed, these small deviations do not have a great effect, but when they are moved, 

they can have a great effect, even affecting the performance. Therefore, a custom earphone with good soundproofing effect and 

comfortable wearing came into being.

     Custom earphones are earphones that customize the earphone shell according to the shape of each person's ear canal. 

Because it is made according to the shape of the ear canal, the fit between the customized earphone and the ear canal 

is very good, which can play the role of isolating external sounds, and it is very comfortable to wear and not easy 

to fall off.

Customize the internal structure of the headset

     Unlike the traditional moving earphones, the sound emitted by the moving iron sound unit has little to do with the internal 

shape of the earphones, as long as the sound guide does not leak, then the sound in the sound unit can all flow into the ear, 

so the sound quality of the customized earphones will not be reduced because it is handmade DIY production, the sound 

quality can be said to be 99% related to the sound unit.

Advantages of custom headphones

     Soundproofing ability, the sound insulation method of custom headphones and in-ear headphones is actually slightly 

different, in-ear headphones are by adding a rubber plug at the ear canal, and custom headphones are including the ear 

canal entrance of the ear all covered to soundproofing. From the effect point of view, the two methods of sound 

insulation effect is not much different, even customized headphones, in the absence of music can also hear the outside 

sound, and in the music sounded, the basic outside sound is difficult to hear distinguish. During a long bus ride, I tested 

the sound insulation effect of customized headphones. When the music volume was higher than the maximum volume, 

I could not hear the sound of the car or the sound of people talking around me, and I could immerse myself in the music. 

In terms of sound insulation, custom headphones are on par with in-ear headphones.

     Wearing comfort, because it is a customized earphone shell according to the shape of each person's ear, then the comfort 

level of wearing is naturally the most comfortable, and the shell of the customized earphone is generally a hard shell, which 

will completely fit with the entire earphone. In order to obtain a better sound insulation effect, the shell of the custom earphone 

is actually slightly larger than the outline of the ear, but this little bit does not affect the comfort of wearing, generally after a 

week or so of the adaptation period, you can fully adapt to the custom earphone. And wear for a long time will not have pain 

feeling, because the principle of wearing is different from the traditional open headphones and in-ear headphones, custom 

headphones are the entire fit on the auricle, so there will be no extrusion for a long time, it will spread the pressure to the entire 

ear, for the entire ear these forces are very small. The above are based on the premise of a good custom earphone production, 

in fact, if the earprint is not good, or the earphone shell is not made, even the custom earphone will not be too comfortable to 

wear. Generally speaking, just get their first pair of custom headphones, wear will have a feeling of rise, about a period of 

adaptation will be improved, if you feel that there is a prominent foreign body feeling or a week later is still very unfit, 

it should be re-made.

     In terms of the firmness of wearing, customized headphones are very strong, whether running or jumping, there will be no 

sliding headphones, especially in the case of movement, you do not have to worry about the ear falling out to affect the sound 

and so on.

     The appearance is fashionable and changeable. You can freely customize the color and graphics, and even set diamonds on it, 

the appearance is quite cool, we can intuitively see the appearance of customized headphones when wearing from the 

renderings of some stars.

     Hygiene. Because it is customized according to the ear canal, the custom earphones generally can not be lent to others to 

wear, even if it can be brought, because it can not be completely soundproofed, there will be sound leakage, and the sound 

heard will be different from the sound heard by the owner of the custom earphones. Because it can only be used by one 

person, it is more clean and hygienic.

Protect your hearing

     Some people here understand that the sound inside the headset is completely into the ear, which is the most harmful to the 

ear, and in-ear headphones and custom headphones are more harmful to the ear. My understanding is that our general habit 

of listening to music is to have a fixed sound size, and the influence of the sound size is the sound pressure, and in a noisy 

environment, if you use open headphones, you may not be able to hear clearly at the usual volume, so you will increase the 

volume of the headphones to cover the surrounding noise. The actual sound pressure at this time should be greater than that 

of in-ear and custom headphones. The main damage to hearing is the sound pressure of the sound, that is, the size of the 

sound, so the better sound insulation effect should actually be able to protect the hearing.

     The internal mechanism of the custom headset is actually very simple, which contains a pronunciation unit, and the 

sound emitted is transmitted to the ear through the sound guide tube.