AV power amplifier is the core equipment of home theater system, with Dolby oriented logic decoding power amplifier, the operation should first know that only the playback of the DVD with Dolby surround sound field can be restored. At this time, the directional logic state can be selected through the surround mode switch, and the central mode can be selected according to the configuration of the speaker. For example, the standard mode is suitable for setting the speaker in the common non-full-tone domain; Broadband mode is suitable for the middle hoist. If there is no middle speaker, phantom mode should be selected. And ordinary stereo audio disc, can only use the power amplifier of digital sound field effect processing, that is, DSP power amplifier to simulate the effect of cinema, such as widescreen film and mono film. Another play different styles of CD or disc, AV power amplifier can simulate different sound field effects, often seen in concert hall, scene, rock, church, jazz, stadium and so on, these can be set by surround effect selection switch.
And when the speaker is not constantly singing, it will make the speaker a good sound. The wrong overuse of speakers can also hurt them. Because of the material, the newly purchased speaker only needs to put his favorite music to watch movies, for a long time, the sound quality will be better and better, don't worry.
Loudspeaker is the home theater sound terminal, the quality of the system has a great impact on the quality of sound, in order to reduce the attenuation of the lead to the signal, should try to choose thick special speaker wire to connect. Wiring should not be reversed. When used, the volume of the power amplifier should not be opened too large to avoid the overload of the speaker.
"Horn and listening space are one", all kinds of sound performance is generated in the interaction between the horn and listening space. According to various conditions, you can find the most suitable horn position in the "eight method of positioning".
★ 17 ratio method: the length of the room are divided into three equal points (three), the horn is placed at one third of the length (one), the interval between two horns for the room two-thirds of the length of 0.7 times (seven). The horn had better have a slight inward projection Angle, but no inward projection can also, listening position can not be attached to the back wall.
Effect: This method can be used in large and evenly proportionally sized Spaces (e.g. 1∶1.25∶1.6 or 1∶1.6∶2.5) to achieve a balanced sound and a wide and deep sound field.
★ 33 ratio method: the length of the room is divided into three equal parts (three), the width is also divided into three equal parts (three), the horn is placed on the length and width of the first equal points of intersection (one). The horn can have a slight inward projection Angle, or even do not need to inward projection, listening position can not be attached to the back wall.
Effect: This method is also used in large size, uniform proportion space. The only difference between it and the 3 17 ratio method is that the distance between the two horns is narrower. This method also achieves balanced sound and wide and deep sound field.
★ Screw hole pendulum method: the horn is placed in the room between 1/3 to 1/2 length, and then the two horns on both sides of the wall as far as possible (such as the room is very wide, it does not need to be close to the side wall), two horn inward projection Angle to greater than 45 degrees. The listening position should be about 0.5 m -1 m after the intersection of the projection Angle crossing lines.
Effect: This method is designed to deal with the treble is too sharp, alto is too thin, bass is not enough shortcomings.
★ Equilateral triangle method: the first condition is that the horn should leave the back wall (at least 1 meters above) and the side wall (at least 0.5 meters above). The second condition is to draw the two horns as an equilateral triangle with the listening position. The third condition is that both horns also project inward at an Angle of 45 degrees or more. The fourth condition is that the equilateral triangle can be large or small. When the room is small and the power after the stage is not big, the equilateral triangle is smaller; When the room is large and the post-stage power is large, the equilateral triangle is drawn larger.
Effect: Its advantage is that it can reduce the excessive interference of the four wall reflection sound to the direct sound of the horn, and get a good sense of positioning and wide and deep sound field. This is the way to hear the most, the most direct, and the most clear details.
★ Long side pendulum method: the horn reverse its way pendulum, with the long side of the room for the horn back wall, the rest according to the equilateral triangle pendulum. Listening position can not stick to the wall, at least 0.3 meters away.
Effect: medium frequency and low frequency sense is enhanced, the depth of sound field is poor.
★ Diamond pendulum method: This method is only used in square space. The square space is regarded as a diamond, and the horn is placed against the wall on both sides of the diamond. Horn behind the rhomboid sharp Angle and listening position behind the rhomboid sharp Angle to do arc or cylindrical acoustic wave diffusion processing, horn should not be too close to the side wall.
Effect: This method can solve the problem of too strong bass boom standing wave in square space. If the square space is not arranged this way, furniture is packed in to "quell" the standing waves.
★ Stick to the wall pendulum method: the horn close to the back wall pendulum, no matter the distance from the back wall 50cm or 30cm it doesn't matter, their deployment can.
Effect: High frequency sharp, medium frequency, low frequency weak use, can make medium frequency and low frequency full, the whole high, medium, low frequency can be balanced. It also makes the depth of the pitch shallower and the width narrower. However, it is right to sacrifice the performance of the sound field for the good sound if it is weighed against the harsh and ugly sound.
Cabinet method: This method is designed for the use of small speakers without legs. If the horn on the low cabinet, to the horn under the cushion of marble or granite, placed between the horn and the stone cone. A vibration-absorbing iron sandbag or block on top of the horn is even better. If the horn is placed on a bookshelf, fill the top, bottom, left, and right sides of the horn with books. In this case, the corner cone is not needed.
Effect: Sound will be full and firm, high frequency will not be harsh. At this time to listen to the sound quality as the first appeal, the performance of the sound field is the second.
