What is the device called which rectangular with a round hole next to the stereo? What s the use?

Subwoofer Subwoofer is a common name or abbreviation for everyone, strictly speaking, it should be: super subwoofer. As far as audio analysis that can be heard by the human ear is concerned, it consists of super bass, bass, low midrange, midrange, mid-high, treble, super treble, etc.

To put it simply, low frequency is the basic framework of sound, medium frequency is the flesh and blood of sound, and high frequency is the detailed reflection of sound.

Subwoofer Principle : The principle of the subwoofer.

Many people must be very strange, why do small satellite speakers have such a shocking sound effect?

Why can't I hear anything when I'm close to the subwoofer (when the crossover ***)?

I'll explain why you want to do that.

The purpose of the two satellite speakers is to produce sound in the frequency range that can be heard, due to their small size and small unit power, their own bass effect is very weak, but their mid and high tones are excellent.

The role of the subwoofer: the internal power amplifier circuit, through the crossover to divide the sound into several frequency bands, the output of the medium and high frequency band to the satellite speaker, the output of the low frequency band to the subwoofer, the subwoofer emits a low-frequency sound of 0 200hz, people can not hear it directly, such a low-frequency sound comes out through the inverted hole, resonates with the satellite speaker, the low frequency and the weak bass produced by the satellite speaker are combined, the satellite speaker will re-perform the subwoofer to release the bass, therefore, the bass effect is very shocking, And it makes people feel the same as coming from the satellite speaker,Here you should basically understand the principle of the subwoofer,As for why the ultra-low frequency and low frequency resonate,It is necessary to understand it with physical knowledge:Satellites are weak bass,Can be heard by people,Their waveform amplitude is very small,That is, the energy is not large enough,When the subwoofer produces ultra-low frequency overlaps with it,Due to passing through the inverted hole,Cause them to be in the same phase,Then the ultra-low frequency is loaded on the waveform of the satellite bass,Because the subwoofer has a very strong power, The energy increases dramatically after loading, so much so that you feel shocked.

Yours is a subwoofer, that one is used to emit a heavy bass I don't know what it's called. When the speaker inside is energized, both sides of the horn will emit a repulsive sound at the same time, and it will cancel out part of each other, so that most of the heavy bass will cancel out If it is completely sealed, the bass is too heavy, and it will be unclear So it is made into a cuboid with a round hole

Friends,Hello,Which speaker behind the round hole is a device that produces audio resonance,When the ** is released,This hole can produce a resonance,So that there will be a "dong dong" stereo sound,It is such a role。 That's why it's called a subwoofer.

The round hole is the guide tube, and the function is that when the speaker is working, the sound wave radiated from the back is radiated to the front after passing through the inverted tube, superimposed with the sound wave in front of the speaker, and then radiated forward together to enhance the low-frequency effect.

You can feel the usefulness of that hole when you plug it in!

There's almost nothing in there, and you can tell if it's useful if you plug the hole.

Computer speakers have 1+2 specifications,This 1,It is a subwoofer,That is, what we usually call a "subwoofer"。 This round hole, of course, is the sound hole!

1. Boolean operation, in the rectangle.

Draw a cylinder on the body, insert it into the box, never calculate it back, 2, keep the answer.

The original box is used as a reference, draw a cylinder to convert into a polygon, select all the faces on the side of the cylinder (do not select the upper and lower sides), use the Extrude modifier or click the Extrude button, remove the edges of the outer circle (not delete), keep the four edges, and use the snap command in the top view to snap the points to the position of the original box, and you're good to go!

Boolean operations, how can it be easy to make mistakes, and it's not that you're not skilled enough.

It can be used as a boolean or as an extrusion.

Boolean can be generated by subtracting cylinders from a box.

Extrusion Draw a rectangle attached to a circle to extrude to generate.

It's an inverted hole.

The inverted tube is another accessory in the speaker, in fact, it is a hollow tube, usually made of PVC material, and there are also metal tubes or cardboard tubes, as long as the inner diameter and length are the same, the effect is the same. The inverter communicates with the outside world through an outlet from the front panel (called a baffle in the term) or the back panel of the speaker, and that outlet is the inverted hole.

Not all speakers have inverted tubes, only inverted speakers are used, and closed speakers (that is, speakers without any openings in the cabinet) do not use inverted tubes.

A brief introduction to the principle of inverted phase.

We know that the electrical-acoustic conversion efficiency of the horn is low, and the speaker will radiate sound waves in both forward and backward directions at the same time when it vibrates, but only the sound waves in front are what we want, so it seems that the backward radiation not only has no effect, but also wastes some energy. In order to solve the problem of energy utilization, there is an inverted speaker, the purpose of which is to use the speaker to radiate energy to this part of the cabinet.

Here we first mention a well-known Helmholtz principle of resonance. To put it simply, a small hole is made on the surface of a closed cavity composed of an ideal rigid body, which is small relative to the surface area of the cavity, and then a hollow rigid body pipe is inserted into the hole, and the overall structure is the Helmholtz resonator. Through the vibration on the back of the speaker, the air in the cabinet is forcibly compressed, and the high-speed resonance in the inverted tube pushes the air near the outside of the inverted hole to vibrate, and the sound waves we hear are generated.

Compared to another common airtight cabinet, the inverted loudspeaker has better low-frequency diving and better electro-acoustic conversion efficiency, but the transient effect of the inverted cabinet is not as good as that of a closed box. Therefore, when we buy speakers, we can't blindly emphasize the inverted design, or we should buy according to our own listening habits.

That's the volume up or down key, or the song fast forward and back key. And the small hole is the MIC receiver hole.

AUX is the audio input interface, which can output audio from electronic audio devices including *** (general headphone jack).

AUX is an abbreviation for auxiliary, which is an additional signal line design.

In addition to the formal output and input terminals, in addition to the formal output and input terminals, there are often several output and input terminals marked with aux as a backup connector.

This terminal can be used when you have a special application, such as an additional sound output or input. This kind of preparatory terminal or line, regardless of the input or input, is collectively referred to as AUX.

It stands to reason that it should be a tweeter, and the following must be a bass, because it is not clear, whether it is a hole or a voice coil inside, or it may not be a speaker, it is the sound tube of the bass cavity, which is used to produce resonance. Enhance acoustics.

Create a box, then create a cylinder, put them together, and then perform a "Boolean" operation on them, so you can dig a circular hole in the box. Please adopt.