Countercurrent 1982

Chapter 158 The Covenant
Everyone was stunned by the scene in front of them. No one thought that this speaker, which seemed to be less than half a meter high, would be so powerful that it could shatter glass from a distance of several meters.

In fact, generally speaking, it is very rare for an ordinary subwoofer to shatter the glass, and the shattering of the glass does not rely on the volume, but the principle of sound resonance.

Resonance A very high-frequency technical term in physics, referring to the situation where a physical system vibrates at a specific frequency with a greater amplitude than other frequencies; these specific frequencies are called resonance frequencies.At the resonant frequency, small periodic vibrations can produce large vibrations because of the kinetic energy stored in the system.

Therefore, when the frequency of the sound will vibrate with some frequencies at a greater amplitude, this resonance will cause a kind of energy storage of the sound wave in the object, and when this energy is stored to a certain extent, it will naturally affect the sound. Objects cause damage.

Glass is a mixture, which contains silicate and a large amount of silicon dioxide and other impurities, so there is no natural frequency, but for quartz glass, there is, between 20000*(1+8%) Hz, human The frequency of the vocal cords is generally not higher than 2000Hz, so it is rare to shatter the glass (resonance), but some special sopranos can reach this frequency, so in later generations there will be people performing treble shattering glass on TV and the Internet technology.

The highest frequency modulation of Duan Yun's subwoofer can just resonate with the glass, so the scene just happened.

"I pay, I pay!"

After a while, Cao Dong came back to his senses this time and responded to Duan Yun repeatedly.

"Too awesome..."

"No wonder Brother Duan calls this a subwoofer, it really lives up to the name."

"It's amazing! Brother Duan can even make this kind of thing..."

The next moment, several people in the room gathered to watch this amazingly powerful speaker, with expressions of surprise on their faces.

Naturally, they cannot understand the principle of this kind of thing with their cultural and technical level, so while they are curious about this kind of speaker equipment, they also admire Duan Yun's superb design ability.

In addition, the successful development of this subwoofer has greatly improved the morale of Duan Yun's team. Cao Dong and others have seen Duan Yun's powerful electronic product design capabilities, which made them admire Duan Yun even more, and also respected this workshop. Future development has added some confidence.

"Look and see, don't move your hands." Duan Yun reminded.

"Brother, this thing will definitely sell for a good price."

"Yeah, this kind of sound is amazing. I don't think the imported speakers are as good as here."

Cao Dong and others quickly realized the commercial value of Duan Yun's new product.

"It's not that easy." Duan Yun shook his head when he heard the words, and continued: "If the price is too high, not many people will buy it. If the price is too low, we will suffer, and there are not many people who know the goods. I will try to go to the city this Sunday. If there are more people who want to buy it, we will make a few more."

In Duan Yun's view, his high-quality self-made speakers can only be sold in the most high-quality, high-priced and small-batch customization. After all, the process of this kind of speakers produced by Master Jing is relatively complicated, and he can make more than ten at most in a month. , so if the price is set too low, there is not much profit.

However, Duan Yun thought in the long term. He didn't expect to sell many subwoofers in the early stage. In his opinion, with more and more domestic music enthusiasts and more and more wealthy people in the city, Duan Yun's This kind of subwoofer will definitely usher in a wave of hot sales. In addition, Master Jing is now hoarding a large amount of wood for making this kind of speaker. In the future, this kind of subwoofer will become the second best-selling product in his stall after the antenna!

After a few people looked around the speaker for a while, they were sent away by Duan Yun to continue working.

Later, in order to prevent the speakers from being damaged, Duan Yun immediately took the speakers back home on his bike and put them under his bed, planning to go to the Sipailou Radio Enthusiast House on Sunday to sell them.

At seven o'clock in the evening, Duan Yun came to the night school to attend classes as usual.

Duan Yun is still in a good mood today, and it is undoubtedly an extra source of income after the matter of the speakers is settled.

After entering the classroom, Duan Yun sat back to his seat as usual.

But what surprised Duan Yun was that Cheng Qingyan and Yu Shulan seemed to have switched places, and now Yu Shulan and Duan Yun were only separated by an aisle.

"Duan Yun, let's go roller skating this Sunday." Seeing Duan Yun sitting down, Yu Shulan asked.

"The weather is a bit hot recently, I think it's better for us to go swimming in Shuibo Temple." Duan Yun turned around and said to Yu Shulan.

Today's Cheng Qingyan was obviously well-dressed, her hair seemed to have been permed, and she was wearing a plaid dress. When she leaned over to talk, Duan Yun felt a strong fragrance blowing towards her face.

"Okay, then I'll tell some of my friends to prepare their swimsuits." Yu Shulan said excitedly.

"Hey? Where are you going to play? You are all classmates, so take us with you too." At this time, the squad leader Song Guozhong who was sitting in the front row heard the conversation between the two, and came over with a smile on his face and said.

"Yeah, let's organize and play together." Another male student came over and said.

"We have enough people." Seeing this, Yu Shulan immediately withdrew her smile and prevaricated.

Although since the last incident, Yu Shulan's fiery temper has calmed down a lot, and she has become more kind to others, but this is only when she is facing Duan Yun, and she is still not cold to other men. Not light look.

"Then let's make an agreement, we will gather at the old place this Sunday." Duan Yun said with a smile.

In fact, when Duan Yun came back from roller skating last Sunday, Duan Yun had already agreed with Cao Dong and the others to continue group activities this Sunday, but Yu Shulan had already proposed it before Duan Yun said it. .

"Okay, then let's see you on Sunday." Yu Shulan also showed a smile on her face.

After class in the evening, as usual, Duan Yun, Cheng Qingyan and Yu Shulan rode home together.

Now the relationship between the three of them is very familiar, talking and laughing along the way, it seems very relaxed.

After Cheng Qingyan arrived home, Duan Yun sent Yu Shulan to the door of the house again.

"Okay, let's send it here." Seeing that it was almost at the entrance of her unit, Yu Shulan signaled to Duan Yun that there was no need to send it.

"The road ahead is dark..."

"It's really not necessary."

"Then go slowly." Duan Yun smiled and settled down after hearing this, then turned the car around and left.

Seeing Duan Yun leave, Yu Shulan brushed her hair with her hands, and got on the car again.

At the same time, a cigarette butt flickered in the distance. Yu Jianguo, wearing a double-strand vest and slippers, looked at Duan Yun who had just left in front of him, and frowned...

(End of this chapter)