Making your own speakers sounds like high-end and complicated, but it’s not. And what about homemade speakers? There are many production solutions for its realization, and there are good solutions, and the safety is comparable to tens of thousands of speakers.
Before 2005, computers and mobile phones were still luxury goods, and it was impossible to pursue the sound quality of speakers, and most people were still listening to CD players with better sound quality. For speakers, it is also to listen to a ring.
Even in 2008, 2.0 speakers were not as popular as they are now, and a useful and cost-effective 2.0 speaker was even more rare. At that time, most people in the market still bought 2.1 speakers. The 2.0 speaker is still exclusive to audiophiles in most cases, and the price is generally 2000+.
Until then, I was using the Rambler 2.1 speaker I used in my rental house when I was working after graduation. Until I bought a house and moved to a new house, I began to feel that the 2.1 computer speaker was completed and could not be competent. So when I have nothing to do, I set out to make a set of 2.0 speakers by myself. It took a total of 1 month before and after.
This article also reviews the process of making speakers in 2008, although it seems that the speakers are average, the amplifiers are average, and the appearance is average. But that’s what we liked in the beginning, just like the girls we chased in those years.
Let’s start with the difference between 2.0 and 2.1
The 2.0 speaker is a combination of speakers with only two channels, left and right, and no accent cannon. The expressiveness of music is extremely strong. Especially in the midrange. It is more suitable for listening to music and vocals.
The 2.1 speaker is composed of a subwoofer and a pair of full-range speakers with weak bass. Bass has an advantage, but midrange performance is not as good as 2.0 speakers. Therefore, it is more suitable for use in movies and games.
Next is the production details at that time, in 2008 the mobile phone camera was not so clear, so the photo clarity was poor, after all, only 1.5 million pixels.
Speaker unit selection
At that time, there were more domestic speaker solutions on the market, and foreign speakers had high prices, few parameters, and high professional capabilities, which were not conducive to later adjustment.
The brands of domestic speakers are: Huiwei, Yindi, Feile, South Whale. Huiwei’s price is inflated, as an old brand in Shanghai, Yindi also gives many foundries abroad, and the price is 1/3 cheaper than Huiwei.
The size of the speaker is a moderate size of 6.5 inches in the middle bass. 8 inches will inevitably lead to the box is too large, which is not conducive to the layout of the desktop. Moreover, it was still a 17-inch CRT monitor.
Combined with the price and brand, the middle and low bass were finally selected: Yindi YD167-1506 6.5-inch wool basin material, maximum power 80W, unit price 106 yuan / piece;
Treble: Yindi YDQG5-34 anti-magnetic treble, maximum power 50W, unit price 38 yuan / piece.
and crossover: Jiaxun AS-23C, crossover point 3200HZ, power 160W;
It is a circuit device in the speaker to separate the input analog audio signal into different parts such as treble, midrange, and bass, and then send it to the corresponding high, mid, and woofer units for replay. ）
The production of the box involves the size of the length, width and height, that is, the internal volume of the box, and the corresponding speaker parameters need to have the corresponding volume to play the best effect.
Taking the sealed box as an example, the volume of the speaker = (inner length * inner width * inner height – unit equivalent volume) * sound absorbing material adjustment coefficient.
Generally, the net volume of a two-way speaker with a bass 6.5-inch speaker is about 14 liters.
The next step is to visit major forums and learn from the experience of others, fortunately, at that time, major manufacturers had speaker cabinet diagrams for their own speaker units, so the following scheme was finally chosen
The use of inverted tube type (those that do not punch holes are called closed boxes or closed boxes; The perforated ones are called inverted boxes; ), box size 360MM*220MM*280MM (height*depth*width), 18MM high-density board.
At that time, you can directly buy the assembled finished small power amplifier on Taobao, the price is about 500, and you can save about 1/3 of the assembly of your own accessories, so you can buy your own accessories assembly.
Power amplifier board: integrated 2 pieces of 3886TF chip power amplifier board, single 3886 maximum output power 65W, price 150 yuan;
Transformer: maximum output power 180W, input voltage 220V, output voltage has dual 25V, dual 15V and single 15V, price 60 yuan;
Adjust the volume level and bass board 40 yuan;
The amplifier shell includes terminal posts and other accessories, 45 yuan.
The whole set is about the total: less than 350 yuan.
Production process (more than ten years, many pictures are lost)
Make boxes, punch holes, sand
The panels of the box are all completed by hand sawing, and aircraft punches and hand drills are used to dig the holes. A reinforcement plate is added in the middle and holes are cut.
The front panel opening was not large enough because the hole punch was not enough, so it could only be chiseled out a little bit. So it doesn’t look good, but it is covered when it hits the horn, which does not affect the beauty.
The box is skin-fitted, and the front panel is polished and painted
Assemble the amplifier
The box has been completed before assembling the power amplifier, so first connect the power amplifier board test machine, and adjust the sponge in the box by the way.
The power amplifier assembly is completed, refer to the seller’s wiring, the wiring is regular, the location is reasonable, and it feels good.
With the second-hand Kenwood CD player received with the trial machine, the purchase of a house decoration almost spent all the savings, TV cabinet and TV have not yet been bought.
In 2008, it was just renovated, and even the purchase of an LCD TV had to wait for a salary
At this point, the production is all completed, of course, I replaced the pair of speakers with a better looking semi-finished box, base and better amplifier.
So the cost is less than 1000 yuan. Until 13 years later, in 2021, I was still reluctant to throw it away, and occasionally listened to it and felt that the sound quality was much better than the current 1,000 yuan 2.0 speaker, maybe this is a feeling.