[Home Theater Network HDAV.com.cn] Two-line crossover is a big concept, there are broad, narrow- minded , or divided into power crossover and electronic crossover. The first condition is that the speaker must have 2 pairs of terminals (for two-way speakers, the three-way can be extended). In the second condition, the high and low frequency dividers in the speaker must be independent, and the two dividers each correspond to a pair of terminals.
After having the above two conditions, there are several ways to play, first say the power division:
1. Use 2 pairs of speaker wires, starting from the output terminals of the power amplifier, connect 2 pairs of wires to the 2 pairs of terminals of the speaker, remove the copper pieces on the 2 pairs of terminals, and then connect them to the high by their respective crossovers. On the woofer; this kind of gameplay is better than using a pair of speaker wires (that is, the most common connection method), and the requirements for the wire are relatively low. The selection of the wire material can be considered in terms of high and low frequency characteristics.
2. The rest remains unchanged. The crossover is taken out from the speaker and placed near the output terminal of the power amplifier (it is generally considered to be connected to the crossover by a 30cm line from the output terminal of the power amplifier), and then the pair of terminals and the pair of terminals are connected by 2 pairs of wires and speakers. Connection, the terminal is directly connected with the horn; the effect is better than the first one. After all, the current flowing in the wire is the current that has been divided, but it should be noted that the high and low frequency divider and the speaker terminal cannot be connected incorrectly, otherwise the treble is burned. Just cry, the appearance is not very beautiful, but some people say that this crossover will interfere with the power amplifier, causing the power amplifier to self-excite and burn, but I tried, there is no problem, the power amplifier may not be shielded in the past, the experience sound is indeed Better than the first one, pure!
3, the rest of the same second, the use of 2 power amplifiers, each connected to the high and low frequency crossover, theoretically better than the second, but I have not tried.
Standard bi-amplifier two-wire split connection method
Let me talk about the electronic crossover:
The above three kinds of gameplay, how to toss, after all, to face the power divider, then the large inductance, capacitance, has already caused the degree of phase torsion, we choose the speaker line is thicker and thicker, but also the single strand, and It is a multi-strand line, a soft line, and a hard line. It is to reduce the internal resistance and increase the damping. You can look at the inductance coil of the crossover. It is pulled up, it is several tens of meters long, and the wire diameter is also Isn't it too thick, or a single stock, how to solve the skin effect? ​​All our efforts and money on the wire are almost exhausted by this coil. As a result, electronic crossover has emerged, and many disadvantages of power frequency division, in the view of electronic frequency division, can almost be solved.
The so-called electronic crossover is to separate the audio by the RC plus amplifier circuit before the amplifier, and then amplify through the respective power amplifiers (2-channel power amplifier for 2 channels), directly connect the speakers, and remove the crossover. The advantage is not It is a saying. But the problem is still there, you have to wait for 2 power amplifiers, the meter is much more, the frequency divider circuit is very important, the frequency drop slope problem, the phase problem, if the solution is not good, there is no buzz. But what if it is solved? Hey, you are secretly playing!
Twenty years ago, I used TDA2030 to do electronic crossover. The power amplifier was less than 500 yuan, and the effect reached 5,000 yuan. Unfortunately, it was too ugly. I moved several times and LP refused to enter the door. It has already changed. For the loess.
Now, listening to the current system, this heart is still not dead.
More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.
Note: This article is transferred from love video. Author: Wu Yue's son. The article is an independent view of the author and does not represent the position of the home theater network.
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