How to choose home theater power amplifier?
In the home theater audio system, every link in the system is very important, from signal source to power amplifier, from power amplifier to speaker. Even every signal line and power cord affects the final listening experience of the entire home theater audio system. Today we mainly talk about power amplifier. Speaking of power amplifier, maybe everyone will say that my entire home theater sound box is very cattle, power amplifier is not simply to enlarge the sound signal? What kind of power amplifier can I use? If you think so, it's a big mistake. In the entire home theater audio system, the speaker is equivalent to the tire of a large truck, which determines that a truck can hold multiple things, while the power amplifier machine is equivalent to the engine of a large truck, it determines whether the truck can run and how fast it can run when it is full of goods. In fact, as far as the whole home cinema sound system is concerned, the barrel effect is very obvious. Whether the effect is good or not depends on the shortest board of the whole system. Home theater power amplifier machine has many technical indicators and technical terms in function and decoding methods, for example, power amplifier front decoder, pure power amplifier rear, home theater power amplifier merging machine, Dolby decoding, DTS decoding, THX authentication, WIFI control and playback, Bluetooth function, HDMI, number of channels, etc. . These have been mentioned in previous articles and will not be repeated. Today, we mainly talk about impedance matching and power matching between home theater power amplifier and speaker. At present, the standard impedance of home theater speakers we use is generally 4 ohms, and there are also very few 8 ohms boxes but they are especially rare. The current power amplifier can adapt to the current speaker from impedance matching, but special attention should be paid to power. Generally, when we choose power amplifier for home theater speakers, the output power of power amplifier must be greater than the power of the speaker and ensure sufficient margin, in this way, the excellent performance of all aspects of the speaker can be fully utilized. Here, I would like to remind my friends that most of the parameters of power amplifier now have virtual targets, and this is also a long-standing problem, especially the Japanese power amplifier brand. Remember some Japanese stereo combinations in previous years? Their power is generally shamelessly marked to tens of millions. What is the concept of several kilowatts, I would like to tell my friends that in general, large shopping malls will promote their stage speakers. The rated power of the 15-inch bass speakers is about 300- About 350 Watts, double 15-inch speakers about 700 watts. When did the sound in our home Drive to such a large power. Of course except subwoofer. At present, Japanese brand power amplifier is still deceiving consumers, specifically because they dare not bid so much power now, but they have played word games for us. Especially X Dragon and X Lanshi, the power amplifier output power they showed us will be known by looking at the instructions, what 2 watts output, 3 watts output, 6 watts output, what single channel output and how many watts output in two channels. I would like to ask who has seen 2 euro and 3 euro impedance speakers? This is confusing. Therefore, when equipped with home theater power amplifier, it is recommended to ask more professionals. Since everyone knows that in the home theater audio system, the rated output power of power amplifier is greater than the rated power of the speaker, but how much power is appropriate in the actual match? Personally, I think the rated output power of power amplifier should be 1. Five times is fine, of course, two times is better. Speaking of which, friends will ask again what to do with such a high-power margin. The higher the output power of power amplifier, the higher the price of power amplifier. Aren't you letting us spend more money? First of all, we must understand the truth that power amplifier can push the Speaker to make a sound. It does not mean that power amplifier can push the speaker. The sound of the sound does not mean that the sound pressure is large, and it does not mean that the power is high, the sound size is not proportional to power and sound pressure. For example, use the tap water to connect the water pipe to wash the car and the high-pressure water gun to wash the car, which is cleaner. The tap water pipe has a large amount of water but insufficient pressure, but the high-pressure water gun has a small amount of water but the pressure is sufficient. The biggest difference between home theater sound and Fever sound is the sense of presence. Especially in the case of big dynamics, where does the momentum of the mountain come from? The home theater audio system requires a strong sense of strength and the shock brought by speed. If your power amplifier is not strong enough, you will feel muddy and watery. The sound is coming out, but the sound pressure cannot be reached. Just like a car running on the road, the maximum speed limit for high-speed power is only 120 kilometers per hour, and a 100-horsepower car can also run to 120 kilometers per hour, but now the sports car is only a few hundred horsepower. Isn't this a waste of gasoline? But when you drive a sports car, you will know that the money is not white, because the two cars are not a driving experience at all, the speed of a 100-horsepower car can't be lifted in the fuel tank, and the sports car only needs to step on the throttle and easily take others out of a few streets. In addition, the high-power reserve of power amplifier in the home theater can obtain smaller harmonic distortion, the speaker has better control, and the sound is of course more real.