Although the title is called idle and toss, the actual situation is that the landlord is not busy at all. I just think that every day except for working at work and getting out of milk, I have to find some other things to do. This is an old age. I want to change the world or make a difference. It's a bit of a daydream, but I change myself slightly. The heart and abilities of life still need to be there. So just sneak in and out, toss something fresh and playful.

The cause of the incident is this. Many years ago, the landlord had always wanted a 5.1 home theater, but when he was a pseudo-literary youth who had no older age, tossing the camera was a serious matter, so basically every month was limited. The money income was invested in the infinite photographic equipment, so although it was heartily, it was not enough. So when I was in the bedroom, I took the 32-inch Konka LCD on the computer, and then I used two pairs of R1000TC Ramblers. Four channels, using KMPLAYER to solve the 5.1 film to listen to a sound is also fun. After I got married, I talked with the leaders about buying 5.1, and the leaders readily agreed, but because 5.1 I chose was Logitech's Z906. The leadership of the home theater is as follows:

The idea is not consistent, this car can not be opened, so use the M100MK Swans to do the front surround, and then engage in two Z906 do surround around, then took the original to prepare for the full frequency box TA2020 20WX2 digital power amplifier (hmm , Want to do a full-frequency box this thing for about 10 years ... ... has not been touched. Then the home and surround use the oldest set of 2.1 speakers in the home, a classic, innovative PC WORKS 2.1 to serve.

Of course, there is no computer in the living room, and there is no decoder amplifier, so every time you want to see a 5.1 film, you have to take the DELL notebook to act as HTPC. Because each time the connection is bothered and not answered, a bunch of cables and plugs look more annoying on the TV cabinet, so there is no interest in using it several times. The leader said proudly. Look, I know you are Three minutes of heat, and then bought me a BOSE SOUNDLINK MINI, that will just sell the National Bank, Apple did not even prototype, bought in 1880 (want to come to no higher than the price of the bar) , I thought to myself, this stuff and the Z906 price is similar, how can we not see 906? However, SOUNDLINK MINI is also very good in mind. At that time, it was always carried with him. Even the songs on the car also used this product. Friends had a meal with songs, and it was a pleasure to play. What kind of home theater 5.1 had given him a headache? Afterwards.

Until last October, the aunt gave me a TV at the National Taiwan University - 3S 65-inch millet TV. The public test report sees:

In addition to the standard version I got, this product has a video version, a pair of wireless surround and a subwoofer. At the time of the report mentioned in the public report, such as the separate release of the audio and video version of a kit listed, the landlord will Buy a set, and then wait for two months left and right, Xiaomi finally released the millet home theater, but is a host with a suit, TV host + surround + subwoofer = 1999 yuan.

WTF, I already have a TV, you want me to buy a TV host to do it, buy a set, want to single out the TV host, and no one wants it. Then only to slam salted fish, hoping that someone would buy a theater version of the TV, separate out the surround and subwoofer. In fact there are many people out there, but the landlord's psychological price is low, only 1,000. But this price is basically the second time to sell, there was once a Shanghai city out of 900 mention, the landlord left a message after eating a meal, the result missed the seller's reply, and then asked to be informed. Then Xiaomi also semi-officially started selling Xiaomi home theater surround + subwoofer without host computer in a Taobao bazaar store, asking for 1299+50 shipping. A full set of 1999, speakers to 1299, TV host to sell you and sell 999, really monkey or Rebs in the line ah. Besides, the leader is not very annoyed to Xiaomi's brand, and at the Xiaomi Forum, there is a lot of feedback on this set of surround + subwoofers. What subwoofer sounds is light, there are current sounds around, and it will be intermittent The key point is that even if this set is connected, full-scale play will also be 4.1-channel, and the pit father is that the TV host audio is more like a mid-position in terms of position, not like a surround. Therefore, the landlord is afraid to spend 1350 to buy a set to come back and even hear a ring can not hear, so try to think or use the original reeling combination, and more convenient is that the home NAS server is placed behind the TV With the installation of WIN10, being a HTPC is just right, so it took 10 minutes to get the line connected. However, a problem was discovered. The subwoofer that had been in service for nearly two decades and had a pill in the innovation 2.1 had already begun to break the sound when the amount of low frequency was a little big. It was not enough to listen to it, but it would not work if it was not connected because the center channel was also connected. Above it, we must first think of ways to solve this problem. There have been mentions in previous testimonials that the millet TV host has the function of Bluetooth audio input, that is, it can be a Bluetooth speaker. The second thing about this Bluetooth speaker is that as long as the TV is on, he can access Bluetooth audio and sing, no matter what source you are or what program. And the TV volume control is disabled for Bluetooth audio. This point appeared to be a bug in the landlord's original, but this time it was a gospel. So the landlord bought a 3.5mm Bluetooth gadget.

Use this stuff to wirelessly transmit the midrange and bass signals on the HTPC to the Xiaomi TV host and use the TV speakers as the center channel. Truthfully speaking, these dozens of pieces of the game really have a general effect, and there is a slight delay, but it is more than enough to deal with only the voice of the center. But the Bluetooth transmission + Xiaomi TV's bass can't be upright, but it will only crack even more, which will cause it to stop listening to the ring. So mumbled and told the leader, I want a subwoofer. The leader asked me if I could buy a small shell bag or buy a necklace when I went to Japan. The landlord certainly answered her without thinking. The leader then approved the landlord's subwoofer acquisition plan with joy. Everyone should see that this is a very unequal treaty, because the landlord wants to buy a subwoofer budget within a thousand dollars, but the leader's fancy package is 8000+...

Well, the matter of the bag will go to Japan in February anyway and say, or to solve your own subwoofer. Truthfully speaking, as a reeling silk 5.1 system, in fact, there is no need to go for a cannon. The idea of ​​the landlord's mind is actually to make a millet sound, and it costs 599 yuan. You can't afford to lose it, or you can't buy it, at least you have a good face value.

Looks better than those stupid black box is not much better, but based on the landlord to hear the sound of this thing is still some pursuit, so on the Internet to find some millet subwoofer disassemble diagram over to see if the internal work How (images from the network):

Although there were no big expectations for hundreds of pieces, it was too simple. Will only be an aluminum tube, plug a 6.5 bass unit, the other plus a passive unit, and then add a power amplifier board to complete ah. From the photos, this aluminum shell is also not imaginary and the unit is estimated to be 30 yuan in stock. Amplifier is TPA3116D2, there is a mono 100W output power, but this power board does not look like 100W. Serious, very detoxifying. Then I didn't want to buy it when I looked at it, and I moved my mind to be a subwoofer. After all, TPA3116D2's power amplifier board, Taobao catch a lot, do not exceed one hundred yuan.

Do yourself a speaker, the hardest thing is? This does not seem to want to think, it does not have to say, we all know that the box. However, fortunately, unlike the past 10 years ago, the number of finished products on Taobao or the number of businesses that accept customization are very objective. In a circle, I found that I was basically silly. And how do you say, without the process and fun of DIY, nothing more than to stuff the unit and power amplifier into the board, and tired. But to tell the truth, Taobao's finished product box was carefully searched and selected to be an 8-inch container. All of them are very safe, and they were accompanied by a unit of Huiwei. Listening to the ring, it was definitely no problem. But one of the biggest problems with the landlord's people is that he is very good and he still thinks differently. So just look and see, find a BOSE AM10 subwoofer structure diagram:

Commonly used in the market closed, inverted, AWS structure of the subwoofer is completely different, the use of small-size full-frequency unit with more transmission line structure (labyrinth box), which is very interesting, or to Do this. And as long as the two 5.25-inch units, the volume is smaller than the 8-inch. Apart from anything else, first follow the diagram and draw a drawing:

Since there is no physical object on the hand and there is no detailed information on the Internet, it basically comes out on the map. Of course, it was originally playing, so no engraved copy, let alone 1:1, plus different sound units (there was also one that BOSE wouldn't use too good units). And the amplifier circuit, the incentive circuit is completely different, so the landlord is also very realistic and does not expect this stuff to be more shocking, as long as you can hear a ring, when you do not break the sound into. If you later make it better than you can hear it, it would be totally unexpected. However, we can see that the size of this box is not small at all. It's almost as big as a full-tower chassis. Isn't it good to be stupid? No matter what, let's do it first.

The box is for Taobao merchants to open the board, in fact, did not deliberately find it, just send the drawings to him, he replies to me and quoted, thinking about the year before you can receive, it is directly set, the price is very reasonable, including the curved part It is carved out of multiple MDF engravings. Friends of the sun list:

The first choice for the unit was to use Swans' S5N:

However, the unit price must be more than 100, and the two must be more than 200. In the event of a bad play, I feel that there is a bit of pain. Then I turn to see the silver flute, the old whale like the southern whale, did not find the right one, and finally bought two of them. Sound 5-inch bass.

The official factory shop purchase, the parameters and the Swans S5N little difference, the price as long as Swans half price, more critical is a 4 ohm model, you can easily match the fancy 2.1-channel power amplifier board, on the shortcomings, that is, a little sensitivity Low, but the high-sensitivity unit price is also high. It may be strange to everyone, because so many eloquent speeches before, are talking about to be a subwoofer, how suddenly a change in the front 2.1. In fact, at the beginning, he really only wanted to be an active subwoofer, but because he copied the picture, he only used two 5-inch units. To tell the truth, his confidence in this cannon was not enough, so he was very flexible. Modified the next. The original TPA3116 mono channel power amplifier board was replaced with a dual TPA3118 2.1 power amplifier board. In fact, this board is most attractive to me because the backplane and knobs are all finished products:

Of course, the shop's so-called 3118 is better than 3116, I can only hesitate, but the 3118 30WX2 power is 8Ω, but the 3116's 50WX2 is 4Ω, so the conversion is not actually the same when the 4Ω speaker, 3118 The output power is only higher? The landlord is Xiaobai, not very clear, but take it for granted, so when buying a horn, he also bought 4 ohms. The biggest advantage of this board over other 2.1 versions is the 2.1 and 0.1 switch. And the subwoofer has a cutoff frequency adjustment knob (30-150Hz). But 60W of power led to two 5-inch bass, really, before the installation really did not grasp, yes, on the power supply, home just has an extra DELL 19V 4.7A notebook power, almost 90W, can be used , it is also a savings.

Of course, in addition to that, some auxiliary tools and accessories, such as speaker cables, screws, and sealing strips, will be introduced.

These are the main parts that were received, in which the baffle sellers of the box were missing during the first shipment. The result of the reissue coincided with the Spring Festival holiday and the postal courier took a full 5 days from Zaozhuang to Shanghai. So the final box was the time when the big guys were all high during the 30th night. The landlord silently screwed the screws in the study room.

Let's look at the power amplifier board first:

The front class used 4 4558 to tell the truth and got the board to see the four op amps. The landlord's first reaction was to throw him. Most of all, the board is cheap, and you have to use 5532. However, if the speaker holes are all open, try it out for a while and it will not be too late.

Two TPA3118s were used, one of which was used as a 2X30 dual channel amplifier and one was used as a 60W subwoofer amplifier. Although the 60W subwoofer is simply not on the table, and even many PC2.1 multimedia audio subwoofer power than this, but the landlord's living room is also 20 square, it should be enough to use, let alone the main unit with the unit It is 4 ohms, theoretically the power will be bigger, but the power supply is only 90W.

On the whole, all the patches used in this power amplifier version were shielded in various areas, and a sealing strip was also attached to the panel. It can be said that the design concept is still relatively perfect, but the work is more general.

On the back of the terminal, knob, switch all aligned, this point to give praise, open hole will be able to use, so that the hand-wrought party save a lot, the overall price will also be in the early days, this price but also what bike, after all, the landlord One of the power amplifier boards in the eye phase has to be sold for 100 if none of them are.

Wan-in 5-inch woofer unit, long-stroke hemp fiber bowl, no research and knowledge reserves in this area. In any case, it was bought with a cheap brand.

The box uses 15mm MDF, and the baffle uses 24mm of 12mm MDF glue. Really speaking, there are conditions to pursue or use HDF is better, the landlord said before the seller missed baffles, the results of the two shaped plates were thrown in the air-conditioned room after blowing a week, the height of the entire 1-2mm shrink. The length of the entire box transmission line is about 1.4 meters and the volume is about 32L.

The two sellers glued the semi-finished products and gave them rough grinding.

The semi-sink hole landlord put a size of 1mm, and it's quite right to make it.

Before bonding, the vacuum cleaner was used to dispose of the floating ash on the surface of the board. It was true that Dyson’s strength was still small, and later the air compressor was used to blow out a lot of dust.

The first board, glue is a little less. Behind them are bolstered by the principle of never neglecting.

After the glue is glued, wait 24 hours for the glue to cure, so this thing looks like a few boards, but it takes 24 hours to move. Of course, in addition to glue, but also in the sticky and nailed gun reinforcement. Or maybe the whole box would break loose.

The error caused by air-conditioning after air-drying is, for the most part, ideally smooth and polished, but without proper tools, the sandpaper frame is too hard to grind. Even if it does, it will become more plastic.

At the same time, the internal seams were all sealed with a hot-melt adhesive. The corner should be a sound-absorbing cotton. However, the sound-absorbing cotton on the hand was too thick, so I found the meaning of a sponge.

This means some glue to the dead. In order to fill gaps caused by flat sheet height errors. The gorilla waterproof strong woodworking glue is used here. Although the price is more expensive than ordinary white glue, it is indeed worth the money.

During the day of the New Year's Thirtieth, the last panel was glued, and those hanging glue were the laziness of the landlord. They thought that the white glue that was used previously could be cleaned very easily afterwards, so when it was glued, there was no tube. The result... ... Well, it's tears to say more. It was originally prepared to put veneer on the surface. Now it's time to think about how to make it.

Then there is nothing to worry about, as long as the hole size is appropriate, it is very convenient.

Because this board only plays a supporting role, it has nothing to do with the sealing of the cabinet, so the upper two screws mean the same, and they are not allowed to change back.

The speaker is first affixed with a sealing strip to enhance the overall airtightness.

A parallel circuit connection is used between the two loudspeakers, so this is soldered on.

The other one used Connectors, but in fact it was safer to think about it.

After the line is connected, the unit will not need to rush to tighten the screw after putting the unit into the box. The first song will be used to confirm the work situation. No problem after fixing.

When fixing, do not screw a screw in the end so as not to cause deformation of the unit skeleton. After the tightening, the functional part of the subwoofer is completed.

Then, with the satellite box, ......, we don't want to call me. The original is to prepare ourselves to be a satellite box, but we found that the finished product box of Wanyin is not more than tens of pieces more expensive than the single-buying unit, so we directly bought the finished product of the 3-inch unit. Box.

However, the satellite box is too mini, and the visual perception of the subwoofer is slightly dissonant. However, there is nothing to worry about. It is not used to listen to songs anyway.

Put first white noise to measure the frequency response:

It seems to be tuned to the cutoff point of 150 Hz, which actually corresponds to 300 Hz, with a depression between 75 hz and 200 Hz. However, the dive is indeed enough, it is already below 50Hz. This does not adjust the speaker, plus a little gain on the computer equalizer. Anyway, just watch the movie and hear it.

As mentioned before, using Bluetooth to connect the millet host to the center channel will cause some delay, so the two satellites are directly connected in parallel to create a center channel, so that when the vocal output in the bass channel has some vocals Separated.

Finally, talk about subjective feelings. First of all, their own expectations were not very high, but actually found some Captain America, World Wars, rescue private Ryan's film, it can be said that the effect is far more than expected The entire sound field becomes broad, and the bass fills are very full. Privately thought it would be better than Xiaomi's subwoofer. The next step is to look at the mood to give this subwoofer a bit of a beautification.

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