table of Contents:
The first chapter of the home theater audio debugging full analysis of the speaker wiring debugging
The second chapter of the home theater audio debugging full analysis of the subwoofer settings
Chapter III Use of Sound Analyzer for Full Analysis of Home Theater Audio Commissioning
The fourth chapter of the home theater audio debugging full analysis of the power amplifier configuration
The fifth chapter of the home theater audio debugging full analysis of the impact of the power supply
The sixth chapter of the home theater audio debugging full analysis of the two-line crossover
The seventh chapter of the home theater audio debugging full analysis of the top ten lies in the audio industry
Continue to discuss the settings for the home theater subwoofer, as follows:
1. If there is a subwoofer, and all other speakers are set to small, the subwoofer ability is very good, the performance of the whole system will be greatly improved (this is the original words of the manual), in this case, the system is missing The province sets the subwoofer to YES, the system will assign all the bass to the subwoofer to perform, and other speakers do not participate in the bass processing;
2. If there is a subwoofer, all other speakers are set to be large, then one parameter will work, that is, the subwoofer is set to LEF or LEF+main:
1) If set to LEF, the system will only be able to handle the bass that is set to a small speaker to the subwoofer, that is, if you set all the speakers to be large and the subwoofer is set to LEF, then the subwoofer is almost It didn't work, so the setup was completely wrong.
2) If set to LEF+main, the system will set the large speaker and subwoofer to perform the bass at the same time. At this time, the low frequency of the system will be balanced. That is to say, if all the speakers are set to large and the subwoofer is set to LEF+main, all the speakers of the entire system, including the subwoofer, will simultaneously express the bass.
3. If there is a subwoofer, other speakers are set to be large, and the settings are small, the situation will become complicated, but this is what everyone really wants to do. There are several possibilities:
1) The main box is set to small, the center setting is set to large, and the surround setting is small. This is not discussed, no one will set this up;
2) The main box is set to small, the center setting is small, and the surround setting is large, this is not discussed;
3) The main box is set to small, the center setting is set to large, and the surround setting is large, this is not discussed;
4) The main box is set to large, the surround setting is small, and the center is small. When the subwoofer is set to LEF, the subwoofer will only display the bass assigned to the surround and center, and will not represent the low frequency assigned to the main box; if the subwoofer is set to LEF+main, the subwoofer will process The low frequency signals of the surround and center also show the low frequency of the main box, and the main box also participates in the low frequency;
5) The main box is set to large, the surround setting is large, and the center is set to small. When the subwoofer is set to LEF, the subwoofer will only display the bass assigned to the center, and will not represent the low frequencies assigned to the main box and surround; if the subwoofer is set to LEF+main, the subwoofer will handle The low frequency signal in the center also shows the low frequency of the main box and surround, while the main box and surround also participate in the low frequency;
6) The main box is set to large, the surround setting is small, and the center is set to large. When the subwoofer is set to LEF, the subwoofer will only display the bass assigned to the surround, and will not represent the low frequencies assigned to the main box and the center; if the subwoofer is set to LEF+main, the subwoofer will handle The surrounding low frequency signal will also represent the low frequency of the main box and the center, while the main box and the center are also involved in the low frequency;
Phase adjustment and phase switching:
Phase adjustment is continuous or segmental adjustment from 0-270 degrees, while phase switching is only two phase shifts of 0 degrees or 180 degrees. Why do you need phase adjustment? Simply put, when the low frequency emitted by the subwoofer is mixed with the low frequency emitted by other speakers, if the phases of the two are the same or close, the total low frequency sense is the sum of the two. Conversely, if the phases of the two are opposite or close to each other, the total low frequency sense will be subtracted. Theoretically, when the gun is placed on the same horizontal line as the main box and the center, its low frequency phase should be the same as or close to the main box and the center. In fact, many factors can't place the gun on the same horizontal line as the main box and the center, but in the corner or side. At this point, the sound phase of the gun may be different from the other channels. It can be adjusted with phase adjustment.
The guns that switch between 0 and 180 degrees are best placed between the corners or the main speakers, as close as possible to the main or center channel. The 0-270 degree segmentless or segmented phase adjustment gun is more flexible. The selectivity is high. How to determine the phase of the adjustment is correct? You only need to use your ear to choose the frequency band that has the most abundant low-frequency sense. A pink noise test disc is a very good test software. Test the frequency of each segment from 20Hz to 150Hz, or select a single frequency to listen. A careful comparison will reveal the most abundant frequency bands.
Super subwoofer placement:
The gun should also pay attention to the position as the main speaker, because the subwoofer will also be affected by the reflection of the adjacent wall or the ground, and the enhanced (positive phase) effect at certain frequencies will also produce offset at certain frequencies ( Reverse phase) effect. In addition, the low-frequency or low-frequency standing waves that are inevitable in the listening space also affect the performance of the subwoofer. So, when you choose the position of the gun, the first thing to consider is: Do I need to increase the volume of the subwoofer by the low frequency enhancement of the wall solution. The second thing to consider is whether the standing wave (caused by the left and right channel elements) that originally existed in the listening space will enhance (positive phase) or cancel (invert) the sound waves of the subwoofer. That is, when we are placing the guns, we must not only consider the opposite phase of the sound waves between the gun and the left and right channels, but also consider the opposite phase between the gun itself and the adjacent ground and wall. problem.
The positive phase and inversion problems caused between the gun and the left and right channels can be solved by the phase adjustment of the gun. As for the positive phase and reverse phase problems caused by the gun itself and the wall surface, it can only be handled by the position of the gun, except for changes to the environment. Simple placement involves many complex considerations. The best way to solve this problem is to keep the sound waves reflected by the adjacent walls and the sound waves regenerated by the subwoofers in the same phase, that is, they are in phase with each other. To maintain the four sound waves of the subwoofer, the ground, the side wall, and the rear wall, the safest method is to keep the reflected sound waves and the subwoofer sound waves within 90 degrees. If the 90 degree phase is converted to a wavelength, it is within a quarter wavelength. However, since the sound wave will reach the wall and then be reflected back from the unit, the travel route is already twice, so we divide the quarter wavelength by two, which is the eighth calculation of the actual wavelength. can.
For example: the choice of the gun's crossover point is 100Hz, then we take the highest 100Hz wavelength to calculate (other lower frequencies are covered). The wavelength of 100 Hz is 340 meters (the approximate value of the sound wave per second speed) divided by 100 Hz, which is equal to 3.4M. The one-eighth wavelength of 3.4M is 42.5CM. Therefore, we should place the guns at a distance of no more than 42.5CM from the side wall, the back wall, and the ground. As a result, the sound waves reflected from the back wall, side wall and ground can be combined with the subwoofer unit. The main sound wave emitted maintains a positive relationship. When all the reflected waves are in positive phase relationship with the main wave, it is the time when the low frequency is the most abundant.
This is why the gun can be placed in the corner to get the most abundant low-frequency feeling. There is also the advantage of placing the gun in the corner, that is, because the low frequency is very good, you can turn down the volume, which means that the amplifier does not have to output so much power, and the unit does not have to move so fiercely. Helps reduce distortion.
According to the above discussion and actual listening, in the case where the front, middle, and surround are set to Small and the above crossover points are unchanged, the SW mode is set to LET. When you watch a movie, you should turn the subwoofer on. When you listen to music (not a very awkward tone), the volume of the subwoofer should be reduced by half or not.
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