Home theater wiring points

With the home projector into the home, home theater is no longer what everyone thinks of the big color TV plus a set of advanced audio and the corresponding amplifier, it is not just a simple arrangement of the general speaker or sound column, but an audio-visual Engineering, its overall layout of the audio-visual space and the integrated effects of various audio systems.

At present, there are many home theater equipments, and the total number of wire rods adds up to a lot. If you put this lot of lines in a less spacious hall, it will make people feel disorderly, which will make the whole home theater environment beautiful. It is very important that wiring is greatly reduced, and that many lines are placed there and are easily touched by people who come and go, causing unnecessary accidents.

Speaking of wiring, there are different timings:

One is to prepare for decoration, so wiring is more convenient and easier.

In addition, there may be some users who have already set up a home theater, but the selected display device is not a projector but a digital television. Now he must use a projector instead of a TV as a display device, and he will face re-wiring. The problem.

What are the sources of a family video?

If by category, it can be divided into:

Video cable, audio cable and speaker cable.

Mainstream video line categories

The video line is intended to transmit video signals. It is used to connect media playback devices and display devices. The media playback devices include DVD players, HTPCs, (VCD players, video recorders are not mentioned), and the video cables are as follows: :

AV cable: This is the oldest video cable for transmitting analog video signals. The ends are the Lotus head (RCA head). Currently, DVD players and TVs will have such an interface. This type of cable is not required for decoration.

S-line: In previous years, there appeared video lines with better quality than AV cables. The interface was round, similar to the PS2 mouse head. This line was also behind, and it is not recommended.

Tri-color difference line: The video line with better quality than the S-line line transmits the analog signal. At present, it should be the best video line in the analog signal. The newly-out DVD players, high-end TVs, and home projectors will all have this kind of video cable. interface. If your playback device and display device are relatively far away, the color difference line should be considered when decorating.

VGA cable: It is also an analog signal video cable. It is most common in computers. Its signal and color difference lines have their advantages. However, as the amount of video data increases, for example, 1920×1080P video signals will be transmitted in the future, then the color difference lines are redundant. It will be larger. After the resolution exceeds 1600x1200, the quality of the VGA line will be slightly later and the length will be longer when it will cause snow. Why do home theaters mention VGA lines? That's because the HTPC goes into the home theater. All projectors come with a VGA connector. The VGA cable is also the kind of wire that must be considered when wiring.

DVI line: Full name Digital Visual Interface, the latest digital video cable, to transmit all-digital signals with no compression technology, the maximum transmission speed is 8Gbps, the digital video signal line currently supported by most manufacturers, the transmission speed of the interface up to 8Gbps, its interface There are 24 + 1 (DVI-D), 24 + 5 (DVI-I) type, DVI-I supports simultaneous transmission of digital (DVI-D) and analog signals (VGA signal), generally HTPC graphics card is generally DVI- I interface, LCD monitor, projector is DVI-D interface. Although DVI-I interface is compatible with DVI-D interface, but DVI-I plug is not inserted DVI-D interface, why? Four more needles. But we still have a way to use a DVI-I to DVI-D converter.

HDMI cable: Full name Hi-Definition Multimedia Interface, digital video cable that is newer than DVI. It transmits all digital signals without compression technology. The maximum transmission speed is 3.95Gbps. In addition to transmitting video, HDMI supports eight channels of 96kHz or mono. The 192kHz digital audio transmission, but the current support for HDMI devices is not too much. Its interface can be converted with the DVI interface (video signal part).

To sum up, in order to support all current display devices during the decoration phase: General television, plasma, LCD TV, rear projection, LCD cinema projector, DLP cinema projector, what lines should we deploy?

If you want to be compatible with all the equipment, it is best to cloth three lines, the most common VGA line (all devices at least support), the color difference line of the analog signal, the DVI line of the digital signal, HDMI interface is less, if there is one This type of device can also be connected to the DVI cable via the DVI-HDMI connector.

Mainstream audio line category

The audio cable is used to connect audio equipment and power amplifiers.

On the market, audio cables with better quality have mainly gold-plated, silver, and oxygen-coated copper. Non-metallic carbon has a high import volume, but its price is relatively expensive. Generally, it takes several hundred yuan. , Mainly the United States MONSTER STANDRDINTERLINK (Monster), AUDIO0UEST (Line St.), SUPRA (Squid), M0NITERPC (Magic), SPACE & TIME (time-out empty), MISSION (Belgium), PATRDNICS (Bai Li), VDH (Netherlands - Van den Haag )and many more.

For the generally popular type (less than 10,000 yuan) audio equipment does not need to deliberately pursue the high quality of the wire, as long as the copper core signal line with a larger general cross-section can be used. For better home theater audio equipment, you can consider using high-quality audio cables. For example, there are optical fiber output and input interfaces on DVD video players and “AC-3” decoders. If you use fiber optic transmission lines, it can improve the sound quality. Get more obvious effect.

Audio line: A set of audio lines is often two, divided into two channels, the two ends of the line are the lotus head (RCA head).

Coaxial lines: Used to transmit multi-channel signals (Dolby AC-3 or DTS signals), similar to audio lines. Due to the large signal volume, the connectors and cables are thicker than ordinary audio cables. Generally, they are used to connect DVD players. Amplifier.

Fiber-optic cable: Also used to transmit multi-channel signals (Dolby AC-3 or DTS signals) for connecting DVD players and amplifiers.

Microphone cable: A two-conductor coaxial cable for connecting amplifiers and microphones. The current rise of wireless microphones, if not for special considerations, can not be considered when wiring, wireless microphone applications will certainly be more and more widely.

The audio line basically does not need to consider when wiring, because the audio source equipment and amplifier are often put together, these lines are very short, can be configured later.

Main speaker line

Speaker cables are used to connect amplifiers and speakers. The current signal flowing through them is much larger than the video and audio cables mentioned above. Because of the large signal amplitude, these types of cables are often not shielded. The key to this kind of cables is to reduce them. Its resistance, because the output impedance of the modern power amplifier is very low, so the demand for the speaker line also increases, such as the use of large cross-sectional area or stranded wire.

Wire rods are available from pure copper to silver wires. A more expensive speaker wire is an oxygen-free copper speaker wire. Its main feature is its good electrical conductivity and low resistivity. When it is used to reproduce sounds, it will not increase in tone. less.

According to the classification of home speakers, it is divided into home theater speakers (usually 6) and HIFI music speakers (two), generally also known as fever speakers.

HIFI speakers are used for high-fidelity restoration of sound recording fields, so there is sufficient protection against lossless transmission of audio signals. In general, transmission lines have different impedances for different frequency signals. This characteristic is reflected in the sound's unrefined sound. For this reason, people have produced a high-grade speaker cable called a smart signal line. This line features The signal is divided into two channels according to the frequency level. A certain thickness of the outer layer passes a signal of 5KHZ or more, and a signal of 5KHZ or less passes through the inner layer of the line. This greatly improves the frequency characteristics of the transmission line and enables playback. The sound is clear and transparent. However, the price is also very expensive. Those brands of audio lines mentioned above also produce fever speaker cables.

Home theater speakers are used to play movies, the main purpose is to reproduce the film's surround sound effects, make people feel immersive, due to multi-channel sound signals and its rich, human ears have no ability to experience the details, so the family Theater speaker wire can not be too demanding, generally with 200-core copper wire, generally a 50-meter in a few hundred dollars.

Here we must also emphasize the home theater subwoofer, this speaker is usually active speakers (and amplifier and speaker combined in one), this speaker line is actually a weak signal audio line, generally at the time of your purchase the manufacturer has been with you A long active subwoofer line is available. If it is not long enough, you can use a thick coaxial cable.

HIFI speaker cable is expensive, but also the speaker is two, it is recommended that the decoration is not wiring, take the line can be, so that you can always upgrade and deal with second-hand products. The home theater speaker cable is the key to the wiring of the decoration. Because of the large number of speakers, the clear line will appear cluttered.

Second home theater cabling

In the home theater wiring (1), there is only video cable. The speaker cable needs to be considered when it is decorated. The audio cable (because the audio device and the amplifier can be placed at the same position, so the audio cable is short) does not need to be considered. Discuss the wiring of video cable and speaker cable below.

Video cable routing

If you only use TV or plasma, LCD TV as a display device, video cable is not too much need to consider. However, home projectors have large screens, strong presence and other display devices do not have the advantages, there must be great development in the future, we can not just for the renovation of immediate considerations, decoration at least a ten-year guarantee for use, within ten years It is estimated that home projectors will definitely enter many families in two to three years.

One end of the video cable connects a DVD player or HTPC, and the other end connects to the projector. The position of the DVD player is generally fixed, generally in the middle of the front of the audio-visual room, and there are three projector positions:

1 Hang the projector on the ceiling of the rear of the room and use a proprietary projector hanger. The position of the projector can be adjusted up and down.

2 If there is exactly one row of cabinets behind the rear wall of the audiovisual room, the projector can be considered in the cabinet or on the cabinet;

3 The projector is placed on the projector, the projector can be moved and placed in front of the person's position.

Either way, it is recommended to connect the video cable from the ground or the ceiling from the front center to the rear, because there are two types of video cables:
The color difference line and the DVI line are very thick, and it is difficult to see when exposed to the outside.

Due to the fact that the color difference line and DVI line are too thick, they cannot be piped. Only the slot can be used. The height of the floor tile should be taken into consideration.

There are no corresponding jacks for the color difference cable and DVI cable. After the cable box is put on the wall, leave a one-meter length for directly connecting the DVD player or the projector. No suitable panel can use the whiteboard, so that the decoration workers can make a hole in it. Both the color difference line and the DVI line quality are critical. Because of the large amount of signals loaded, these types of wire rods require high quality wire rods and are generally expensive.

Speaker line wiring

The speaker cable can be arranged in 5.1-channel mode. If the audio-visual room is large enough, you may want to use a more professional device. You can also create a 7.1-channel mode. However, the 5.1-channel surround sound effect is very good. Too much effect in pursuit, more importantly, sound quality and picture quality.

5.1-channel and 7.1-channel speaker positions

One end of the speaker cable is connected to the amplifier and one end is connected to the speaker. The connection scheme of the 5.1 channel is as shown in the figure below. The low speaker is not placed in the direction of the bass and is usually placed next to the amplifier. The low speaker cable also does not use cloth.

5.1 multi-channel speaker setup and wiring schematic

If a 200-core copper cable is used, the speaker cable can be worn in a PVC pipe, and the bottom box of the cable box is marked at the wall outlet position. The panel can be used with a white board (or the hole on the white board can be used). There is also a meter long behind the wall for direct connection to the amplifier and speakers.
Mount the surround speakers 60 to 90 cm above the listener

The height of the front main speakers should be the same as the height of the sitting human ear, and the surround speakers can be about 60-90 cm taller than the human ear.

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