Everyone was simply stunned by the scene in front of them, no one thought that this speaker, which seemed to be less than half a meter high, had such great power, and could shatter the glass from a distance of several meters.

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

A term used in resonance physics that uses very high frequencies refers to the situation in which a physical system vibrates at a greater amplitude than other frequencies at a specific frequency, and these specific frequencies are called resonance frequencies. At resonant frequencies, small periodic vibrations can produce large vibrations because the system stores kinetic energy.

Therefore, when the frequency of sound will form a larger vibration with some at certain frequencies, this resonance will cause a kind of energy storage of sound waves in the object, and when this energy is stored to a certain extent, it will naturally cause damage to the object.

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

The highest point of Duan Yun's subwoofer FM just happened to resonate with the glass, so the scene just happened just now.

"I'll pay me!"

After half a ring, Cao Dong came back to his senses this time and said to Duan Yun in a loud voice.

"It's awesome......"

"No wonder Brother Duan called this thing a subwoofer, it really lives up to its name. ”

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

The next moment, several people in the room gathered around to look at this powerful speaker, and their faces were full of surprise.

With their cultural and technical level, they naturally can't understand the principle of this kind of thing, so while they are curious about this kind of speaker equipment, they are also impressed by Duan Yun's superb design ability.

In addition, the successful development of this subwoofer has greatly improved the morale of Duan Yun's team, and Cao Dong and others have seen Duan Yun's strong electronic product design capabilities, which makes them more respectful of Duan Yun, and also has some confidence in the future development of this workshop.

"Look, don't mess around. Duan Yun reminded.

"Brother, this thing must sell for a good price. ”

"Yes, this kind of sound is amazing, I don't think imported speakers are as powerful 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 this, and then said: "If the price of this thing is high, there will not be many people who buy it, and if the price is low, we will suffer, and there are not many people who know the goods, and I will try to go to the city to sell it this Sunday, if there are many people who want to buy it, let's make a few more." ”

In Duan Yun's opinion, his high-quality self-made audio can only be customized in small quantities at the most high-quality and high-price, after all, the sound process made by Master Jing is more complicated, and he can make more than ten at most a month, so if the price is set too low, it will not make much money.

However, Duan Yun thinks about it 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 rich people in the city, Duan Yun's subwoofer will definitely usher in a wave of hot sales, in addition, Master Jing has now begun to hoard a lot of wood to make this kind of audio, and in the future, this kind of subwoofer will become the second hot-selling product after the antenna!

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

Subsequently, in order to avoid the speaker being damaged, Duan Yun immediately rode the speaker back to his home, put it under his bed, and planned to go to the radio amateur home in the fourth arch on Sunday to sell a wave.

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

Duan Yun is still in a good mood today, and if he has done the speaker thing, it is undoubtedly one more way to make money.

After entering the classroom, Duan Yun sat back in his place as usual.

However, to Duan Yun's surprise, Cheng Qingyan and Yu Shulan seemed to have changed positions, and Yu Shulan and Duan Yun were now only separated by an aisle.

"Duan Yun, this Sunday, let's go rollerblading. After seeing Duan Yun sit down, Yu Shulan asked.

"It's been a bit hot lately, so I think it's better for us to go swimming in Shuipo Temple. Duan Yun turned his head and replied to Yu Shulan.

Today's Cheng Qingyan was obviously carefully dressed, her hair seemed to have just been permed, and she was wearing a dress with a painted checker, and when she came over to talk, Duan Yun felt a strong fragrance on her face.

"Okay, then I'll talk to a few of my friends and tell them to get their swimsuits ready. Yu Shulan said with some excitement.

"Hey, where are you going to play, you're all classmates, take us with you. At this time, Song Guozhong, the squad leader sitting in the front row, heard the conversation between the two, and also came over with a smile on his face and said.

"Yes, let's organize a game together. Another male student next to him leaned over and said.

"Enough of us. Seeing this, Yu Shulan immediately restrained her smile and prevaricated lightly.

Although since the last incident, Yu Shulan's fiery little temper has been restrained a lot, and she has been a lot kinder to people, but this is only when she is facing Duan Yun, and she is still lukewarm to other men.

"Then let's talk about it, meet at the old place this Sunday. Duan Yun said with a smile.

In fact, when he came back from rollerblading last Sunday, Duan Yun had already agreed with Cao Dong and them to continue group activities this Sunday, but before Duan Yun could say it, Yu Shulan had already taken the initiative to propose it first.

"Okay, then we'll see you on Sunday. Yu Shulan also had a smile on her face.

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

Now the relationship between the three of them is very familiar, and there are talks and laughs along the way, which seems very relaxed.

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

"Alright, let's send it here. Seeing that she was about to arrive at the entrance of her own unit, Yu Shulan signaled Duan Yun not to send it.

"The road ahead is black ......"

"Not really. ”

"Then you walk slowly. Duan Yun smiled when he heard this, and then turned the car around and left.

Seeing Duan Yun leaving, Yu Shulan swept her hair with her hand and got into the car again.

At the same time, a cigarette butt flickered in the distance, and Yu Jianguo, who was wearing a two-tendon vest and slippers, looked at Duan Yun who had just left in front of him, and his brows suddenly furrowed......

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