Precautions for connection of home theater speaker equipment

How to place the speakers: The correct placement of the speakers is one of the factors to obtain a good sound reproduction effect. The following issues must be paid attention to when placing them: 1. The distance between the two speakers is not less than 1.5~2 meters, and keep the same level. The distance between the left and right sides of the speaker and the wall should be the same. There should be no debris in front of the speakers. 2. The tweeter of the speaker and the listener's ears should maintain the same horizontal line, and the angle between the listener and the two speakers should be 60 degrees, and a certain amount of space should be left behind the listener. 3. The walls on both sides of the two speakers should be acoustically consistent, that is, the walls on both sides should have the same reflection of sound waves. 4. If the directionality of the sound waves of the speakers is not wide, place the two speakers slightly to the inside. 5. For small speakers, if you feel that the low frequency is not enough, you can place the speakers close to the corner of the wall. What problems should be paid attention to when connecting audio equipment? The matching of audio equipment between all levels is more important. Improper connection will not only affect the playback effect of the equipment, but even damage the equipment. 1. The basic requirements for equipment connection: (1) Signal level matching: When connecting audio equipment, you must pay attention to the difference in input and output signal levels between the equipment. If the input signal level of the front-end equipment is too large, non-linear distortion will occur. Otherwise, the signal-to-noise ratio of the Loews playback system will be reduced, and the amplifier of the next-level equipment will not even be able to drive. Therefore, pay attention to the equipment when connecting. The level between the two should not be too different. If the signal level does not match in actual use, the input signal level must be reduced by the attenuation circuit, or the input signal level must be increased by the amplifier circuit. For a general dynamic microphone, the output voltage is a few millivolts, so it is necessary to have a first-stage amplifier circuit to amplify the signal and send it to the pre-amplifier circuit. For recording decks, CD players and LD players, since the output signal level is above 0.755~1V, it can be directly sent to the preamplifier. (2) Impedance matching: In Hi-Fi audio equipment, for example, the output impedance of a transistor power amplifier is low impedance, while the output impedance of equipment such as a tube power amplifier is high impedance. If they do not match the impedance when they are connected to the speaker, the output power of the amplifier will be unevenly distributed, or the transient characteristics of the speaker will be worse due to excessive damping. There are generally two types of impedance matching connections: balanced and unbalanced. The so-called balanced type means that the impedances of the two-core shielded wires that transmit signals to the ground are equal. The so-called unbalanced type refers to the two-core shielded wire, one of which is grounded. When the balanced output is connected to the unbalanced input, it must be matched by adding a matching transformer. 2. The connection method of the connector: In Hi-Fi audio equipment, the connection of the equipment is completed by various connectors. The commonly used connectors are as follows. (1) Two-pin plug: Mainly used to transmit signals between various equipment and as an input plug for microphone input signals. According to its diameter, there are three types: 2.5mm, 3.5mm, and 6.5mm. (2) Lotus plug: It is mainly used for input and output plugs between audio equipment and video equipment. (3) XLR plug (XLR): Mainly used for the connection between the microphone and the amplifier. (4) Five-pin socket (DIN): Mainly used for the connection between the cassette recording stand and the amplifier, it can concentrate the stereo input and output signals on one socket. (5) RCA plug: RCA plug is mainly used for the transmission of video signals in equipment. (6) F and M plugs: it is mainly used for the input and output of radio frequency signals in audio-visual equipment.