In the field of home theater audio system and professional sound reinforcement, the speaker drive mode is a single-amplifier built-in crossover mode. The dual-amplifier mode may be rare. It has been popular for many times many years ago, but it has not been obtained for various reasons. Widely used and promoted. However, in the modern sound reinforcement system with higher requirements and higher power, the dual power amplifier mode is gradually valued by the majority of enthusiasts (high-level players) and audio-visual enthusiasts. What are the specific functions? The following small series will introduce:
The home theater audio system dual-amp mode, mainly uses two amplifiers to push the speakers, one of which is used to push the treble and midrange of the speaker, the other is used to push the bass of the speaker, and also needs a dual output The preamp amplifier drives the two stereo rear stage amplifiers. Compared with the single-amplifier drive mode, the dual-amplifier mode can eliminate the shortcomings of many single-amplifiers, making the sound quality more pleasant.
The home theater audio uses a bi-amplifier drive, which allows each speaker unit to obtain more precise driving power, and the characteristics of each unit can be used to make the sound quality more pure. In the bi-amp mode, the crossover and crossover characteristics are easier to control. Since most of the speakers use the integrated circuit active filter to divide the frequency, the sound signal is weak before entering the amplifier, and it is easier to thoroughly complete the sound. The frequency division compensates for the acoustic defects of the speaker unit, reduces the crossover crossover area, improves the electro-acoustic index, and increases the adjustability.
The bi-amp mode improves the damping coefficient of the home theater audio system. The damping coefficient is high. The power of the amplifier is higher. The crossover components used in the built-in crossover are high-impedance originals. The power divider will greatly increase the circuit. The total impedance reduces the control power of the power amplifier. In the dual-amplifier drive mode, there is no built-in frequency divider circuit, and there is no adverse effect on the damping coefficient of the system. The power divider also has an influence on the phase as a phase original. At different frequencies, the phase of each sound unit itself is complicated. If the power divider is designed without considering the phase problem, it is likely to be the sound unit. The crossover curve is uneven, making the sound of the speaker more difficult to hear. The bi-amp mode is easier to phase control than the built-in crossover, and the phase characteristics are better.
The home theater sound system is in dual-amp mode, which can reduce sound distortion and power loss. Compared with single-amplifier drive, it can ensure the sound quality is wonderful.
With bi-amp mode, the speaker's Bi-Wire is an absolute premise. The Bi-wire design solves the inconsistency of the reference point to a certain extent, and brings considerable sound quality improvement. One year ago, the dual-amplifier driver was not popular. One of the reasons was that the major speaker brands did not provide a two-line crossover terminal on the speaker. Today, we can see that there are four terminals in the cabinet on many high-end speakers, which is prepared for the two-line sound.
Of course, the dual-amplifier drive will undoubtedly increase the cost of home theater audio system construction, but the bi-amp drive mode can accurately determine the crossover point according to different environments, reduce insertion loss, increase adjustability and better phase characteristics. The sound that makes the speakers come out is even more beautiful. In contrast, our home theater sound system can get better sound effects, and why not do it. More home theater games, welcome to pay attention to China's home theater network WeChat: cnhifi.
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