The passionate July is coming again, the author has been thinking about what to do and not wasting this great summer. A few days ago I finally thought of a good idea, and I used my brain to make a set of 5.1 speakers I always wanted.
With the development of computer technology, the technology of computer motherboard integrated sound card chip has been improved. At present, the integrated sound card of the motherboard has been developed from 2-channel stereo to 5.1-channel or even 7.1-channel. A few years ago, the "noble" sound card, such as SB Live! 5.1 series package products can be bought in the computer market for 200 yuan, so that we can now make our 5.1 desktop home theater show a big DVD shock at a lower cost. sound effect.
DIY principle
So what kind of speaker is used with our 5.1 sound card? The high-end 5.1 speaker M20-5.1 produced by Swans, the sound quality is very good, but its price of 2300 yuan is enough for us to buy a high-end graphics card. Domestic 5.1 active speakers with prices ranging from 500 yuan to 1,000 yuan are also good choices, but like the author, in order to enjoy the music, there is a better set of 2.1 speakers, and then spending a silver to buy a set of 5.1 speakers is not in line with " The principle of economics. In fact, we can completely keep the original set of speakers, and then buy two sets of speakers, you can DIY a set of 5.1 speakers. In this case, even if you buy another SB Live! 5.1 sound card, the total cost is only four or five hundred yuan, which is quite cost-effective.
We know that the sound card with 5.1 channel output is realized by the three audio output interfaces on the sound card: the “LINE OUT†port is responsible for outputting audio signals to the front speakers, and the “REAL OUT†port is responsible for outputting audio signals to the surround back. The speaker, “CENTER/BASE†port is responsible for outputting audio signals to the center speaker and subwoofer. 5.1 The front speakers in the speakers should focus on the middle and low sounds. This is because we need the front speakers to generate strong shock, and strive to show the strong sense of presence in the DVD blockbuster. Speaker. The requirements of the rear surround box can be lower. It focuses on the high-pitched expressiveness, which can play a role in icing on the whole audio environment. Generally, the active speakers of 100-150 yuan on the market can be used. The center speaker focuses on the performance of the midrange, so that the characters in the film can be truly presented in our ears, and about 100 active speakers on the market. The woofer needs at least 5 inches in diameter, which makes the bass dive deeper and more expressive.
There are two other options for the other two sets of speakers. In the first case, you have a normal 2.0 (or 2.1) speaker, and then buy a set of ordinary 2.1 speakers and a set of ordinary 2.0 speakers for surround speakers (or two sets of ordinary 2.0 speakers); the second situation is like the author already has a fairly good 2.1 speakers as front speakers and subwoofers, and then buy two sets of ordinary 2.0 speakers for surround speakers and center speakers. However, the second solution requires a modification of the speaker cable to obtain a better sound effect (if the original 2.1 speaker is very common, it will directly receive the "CENTER/BASE" interface of the sound card, and buy two sets of ordinary 2.0 speakers. One set is connected to "LINE OUT", one set is connected to "REAL OUT", and the change has no meaning). Line change
The purpose of our speaker redirection is to separate the character dialogue voice and the subwoofer signal from the center channel of the sound card's “CENTER/BASE†port output, and transmit the subwoofer signal to the original 2.1 speaker subwoofer, which will be centered. The channel's character-to-white audio signal is sent to the center speaker (2.0 speaker), so that we can hear the pure character dialogue in the DVD blockbuster in the center speaker, and the subwoofer in the subwoofer of the 2.1 speaker.
Step1 Use scissors to cut the audio signal line of the center speaker (2.0 speaker) from the center, and peel off the two signal lines connected to the center speaker. We can see that each of the two signal lines contains an audio signal line. Enameled wire wrapped) and a ground wire. Connect the audio signal lines in the two signal lines in parallel, and also connect the ground lines in parallel (Figure 1). With this wiring, the two speakers of the center speaker can sound at the same time.
Step2 Prepare an audio cable with a 3.5mm audio plug for use as a subwoofer (the better 2.1 speaker cable and subwoofer are not integrated), and connect it to the audio cable connected to the “LINE OUT†audio signal output port. Connect to the 2-in-1 audio adapter (Figure 2), transfer to the subwoofer audio input port of the 2.1 speaker, and then handle the other end of the subwoofer as in step 1.
Step3 Then find a 3.5mm audio plug cable at one end, and strip the two signal wires separately (Figure 3). One signal cable is connected to the center speaker cable prepared in step 1. Another signal Connect the line to the subwoofer signal line of the 2.1 speaker prepared in step 2. Pay attention to the audio signal line connected to the audio signal line and ground line when connecting. At this time, we need to determine which audio signal line the center audio signal and the subwoofer signal are respectively on. Connect it as shown in Figure 3. Plug the audio cable into the “CENTER/BASE†port of the sound card and play a DVD movie with 5.1 channel audio code. Pay attention to the sound of the center speaker and send out the characters in the play. The dialogue sound is that the connection is correct, otherwise the connection between the center speaker cable and the subwoofer line is exchanged.
After the audio cable is connected, separate the audio signal cable from the ground wire with an insulating tape or a heat-shrinkable hose. Be careful not to short the two. At this point, we will complete the circuit of the speaker, and the next step will be to place the speaker.
Speaker placement
1. Place the front speakers on both sides of the display according to the left and right channels. The display should be 20~30cm away from the display. When the speakers are placed, they should be placed on the side of the display. The speakers face the listener.
2. Place the 2.0 speaker as the center speaker on top of the monitor. The back of the speaker is slightly raised so that it is slightly tilted to the listener. Require your speaker to have good anti-magnetic performance, otherwise you need to keep a distance of 30cm from the monitor to avoid magnetizing the display. The advantage of this placement is that you can accurately feel the white voice of the characters coming from the front.
3. The surround speakers should be placed equidistantly on the left and right rear sides of the listener. The speakers face the listener and can be hung on the wall. If they are far away from the wall, they can be raised with a speaker stand or other objects.
4. The subwoofer is best not to be placed on the table, placed on the ground in front of the listener, and placed in a random position. It should be noted that the inverted phase hole of the subwoofer should not be close to other items, otherwise it will affect the bass effect.
5. When placing the front, center, surround speakers and subwoofer, adjust the position according to your own room conditions, so that the display, front, surround and center speakers are basically on the same plane, and the speaker spacing should not exceed 2 meters to avoid excessive sound delay. This requires a lot of time to adjust to find the right position, so that the middle and high notes sound naturally clear, the bass is thick and thick, so that the listener is in a cross-gold listening area.
After everything is adjusted, put in a DVD blockbuster, let us feel the passionate scene!
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