Siheyuan: Xu Damao, I want to go to the moon

From the 50s to the early 60s, car radios were still mono as standard, but some brands of cars had begun to install an additional speaker in the rear compartment and use delayed playback to create and achieve the "echo" effect.

It wasn't until 64 that the automobile brand Clarion launched a true stereo car audio system. In the early days, the speakers were installed in the front and back, but it didn't take long for it to evolve into pairs of speakers installed on the doors and dashboard to create a true stereo sound effect.

HIFI is the abbreviation of High-Fidelity in English, which literally means "high fidelity". Its definition is: reproduced sound that is highly similar to the original sound.

Originally in the early 50s, radio stations, media and audio manufacturers began using this term to describe high-fidelity audio technology as a sales strategy and marketing tool, but at that time it was just a subjective concept.

It was not until the 60s that the Hansmeow Standardization Association (DIN) developed the DIN standard. This standard also provides guidance for the quantification of Hi-Fi and the minimum technical indicators for products to use the term "Hi-Fi".

Entering the 70s, Hi-Fi equipment manufacturers such as Burmester and Dynaudio were born one after another and created many products. The hardware market also gradually prospered. (Some content has references to literature)

As for the AV amplifier, it is a set of standards for home theaters, emphasizing the sound field atmosphere.

But now it is 1958, and these things are basically non-existent in China.

Not to mention China, it has not yet developed internationally. It is completely a blue ocean track.

but--

Xu Damao didn't understand these things either. He was a student majoring in digital media arts, an ordinary undergraduate. Naturally, he didn't understand the historical parameters of speakers and HIFI.

But he has used it!

Who among the college students of the future doesn't have four, five or six headphones and small speakers? From the 9 yuan plastic garbage desktop USB speakers, to the several hundred yuan college student entry-level subwoofers, then sports Bluetooth headphones, bone conduction headphones, gaming e-sports dedicated HIFI-level 9-delay sound recognition 0 stereo surround...

Taking a step back, he still has to shoot and edit videos. So the headphones and speakers he uses for himself can't be that bad, right?

Soundbar, subwoofer, zero delay, surround sound, 0 channels, HIFI, Dolby… Although I don’t understand these, they are all familiar keywords.

When Xu Damao showed a movie in the countryside, the sound system he used was not much different from the big speakers used in the village. It was mono without subwoofer, but the loud sound was enough.

But he has already created B-BOX and Emperor Sound, and he wants to try rap.

If your speakers can't keep up, he won't be able to stand it.

It’s like listening to Zhou Shen’s Siren Song on an old opera player, and you always feel like the speaker will explode in the next second.

It's really unbearable!

No matter how good your song, planning and performance are, if the sound quality can’t keep up, the effect will be half lost.

So he explained the problem to Section Chief Huang, Director Li and others, but no one took it seriously.

Until Xu Damao performed a B-BOX bass electronic music without using a microphone, and then performed a recitation of imperial voice, and then performed both pieces again with a microphone.

Only then did the people sitting in the audience realize the difference.

Li Huaide scratched his head: "There is a big difference, but everyone is like this, right? There shouldn't be any problem, right?"

In his subconscious, the performance will be held in this auditorium anyway, so it doesn't matter to everyone, so there's no need to dwell on this issue?

Xu Damao looked around. He had just listened carefully and found that the spatial layout and soundproofing of the auditorium were not good enough. But who would study this problem in this era? And it was a factory-level auditorium.

The speaker position is not right either. There are too many speakers and the power is sufficient, but the volume balance is not adjusted properly...

Simply put, it's unprofessional.

Xu Damao came back to his senses and explained to Li Huaide: "Brother Li, if I were to participate in the performance by myself, it would be fine. I'm just having fun."

"But your goal is to be in the top three! Just think about it, if we have professional sound systems, we can use them when we perform--"

Needless to say, Li Huaide's hair stood on end. He knew very well the difference between the sound of resonant bass and the sound of just a loud speaker. The former could provide a sense of shock at the soul level and was particularly convincing.

But then he frowned and said, "But Damao, if we change the speakers, the ones from the art troupe will also be used, and we will be on the same starting line again. There is no point in doing this."

"Besides, if we purchase professional speakers for a party, it would be too extravagant and wasteful. The factory will not agree to it."

"One last question. The microphone is already top-notch in China, and there's no way to change it. But the speakers, the subwoofer you mentioned, I've never heard of it, where can I find it?"

He basically understood what heavy bass was, but he had never seen such a thing before. Even in the compound of his father-in-law, a ministerial-level leader, he had never seen it.

Xu Damao smiled slyly: "It's better if there is no such thing, we can do it ourselves!"

You, a projectionist, want to make a speaker? Or something that never existed before - a subwoofer?

Director Li and Section Chief Huang looked at each other. Is Xu Damao crazy?

It's just a performance, and you have to make your own speakers?

Are all art students so crazy?

"Okay, guys, let's make a speaker by hand first, and you can see the effect once you try it."

So Xu Damao and Li Huaide went to the logistics warehouse and got a bunch of random materials, because they were just making a speaker by hand to prove it, it was not high-tech.

And the most critical issue is that this thing is in the books that Xu Damao read recently. It is the 53 edition of "Fun Physics" and several books on "Physics". These are middle school physics textbooks! They are still the continuation of the physics syllabus teaching content of the Russian bear.

Although it does not directly explain how to make a speaker, it does talk about how electromagnetic force is converted into kinetic energy. The kinetic energy can cause the paper to vibrate and produce sound. The principle is very simple.

Moreover, Xu Damao also did related experiments when he was in school, and also checked the tutorial on B station. All you need is a paper shell, copper wire, tape or glue, and audio cable - it's very simple to make a paper cone speaker.

In just 20 minutes, an ugly thing that looked like a flower pot was created right in front of everyone.

Everyone looked at the large wooden speaker hanging on the wall, then at Xu Damao's paper shell flower pot, and asked each other in bewilderment, "Will this work?"

"Remove the word 'ma'! It will definitely work!" Xu Damao simply connected the equipment in the auditorium with an audio cable, and then asked Li Huaide and others to hold it carefully. He stood far away and tried it with a microphone.

Although the effect is average, this speaker is really useful!

This shocked Li Huaide and others. Is it true that you can't judge a person by his appearance?

As a projectionist, you are already a "cutting-edge" talent if you can maintain a projector, but can you also hand-make a speaker?

It’s made of paper shell, and the effect seems pretty good? !

Before they were finished being shocked, Xu Damao used a wooden box and some plastic tubes to mess around, glued some sponges to the inside of the wooden board, and put a layer of metal mesh on the speaker...

Anyway, in their eyes, Xu Damao was just messing around, and soon the paper cone speaker turned into a wooden box. Then he asked Director Li and Section Chief Huang to hold it close to their ears and not drop it.

I ran far away and picked up the microphone - B-BOX bass electronic music turned on!

After a beat, Li Huaide and Director Huang were shocked!

"Fuck!"

"Da Mao! Bull beep!"

"I want this!"

"My bass!"