How to match home theater speakers and power amplifiers?

                    How to match home theater speakers and power amplifiers?

Many people want to build their own home theater, but home theater is not about buying a speaker, but a combination of an amplifier and an amplifier. To get the best sound and picture quality, you have to consider the impedance and power of the speaker and amplifier. , Whether the damping coefficient matches, but also to master the matching method of speakers and power amplifiers.

01 Impedance matching

It means that the rated output impedance of the power amplifier should be consistent with the rated impedance of the speaker. If the rated impedance of the speaker is greater than the rated output impedance of the power amplifier, the actual output power of the power amplifier will be less than the rated output power, resulting in an incomplete sound and low volume. If the rated impedance of the speaker is less than the rated output impedance of the amplifier, the actual power will increase, resulting in distortion, and the amplifier is in danger of overloading.

The rated load impedance value that the power amplifier circuit should be connected to is a basic parameter for the manufacturer to design the power amplifier. The transistor power amplifier is a low-impedance output circuit, while the tube power amplifier is a high-impedance output circuit, which has very strict requirements on the impedance value of the speaker.

02 Power matching

If the impedance of the speaker meets the matching requirements, and the withstand power is smaller than the power of the amplifier, the driving power is sufficient and it sounds very comfortable. This is often said that the reserve power of the power amplifier must be large in order to fully express the full connotation of music, especially the low-frequency part of the music, which is more vivid and powerful. This is a good match.

If the rated impedance of the speaker is greater than the rated impedance of the power amplifier, although both can work safely, but the power amplifier pushes the power is not enough, you will feel that the loudness is insufficient, often it has been turned on to the saturation state, the distortion is intensified, and you still feel powerless. If the power of the amplifier is greater than the power of the speaker, the low frequency will feel strong and powerful when listening to music, but for beginners, pay attention to avoid the speaker from being burned out.

03 Damping coefficient matching

The so-called damping is an indicator that measures the internal resistance of the output stage of the power amplifier to the damping of the speaker. If the damping coefficient is too high, the sound from the speaker will be dry and not round; if it is too low, the sound will tend to stick together.

Some speakers require a high damping coefficient to control the action of the unit, but if it is equipped with a power amplifier with insufficient damping coefficient, the unit will lose control, causing excess resonance and audio loss; on the contrary, if a pair of speakers that do not require a high damping coefficient The speaker is equipped with a high-damping power amplifier. Due to the high-damping control of the unit, the sound will become solid and the sound tail will be extremely short.

When matching power amplifiers and speakers, the main thing is to consider whether the above three aspects match. The right door to the door will last a long time. But in general, when planning to build a home theater audio system, you should look at your usual usage habits. The main purpose is to watch movies and listen to music. In terms of amplifier selection, you can choose and match according to the proportion of watching movies and listening to music.