In the field of automotive electronics, passive crossover networks have a wide range of uses, especially in the field of coaxial speakers and split speakers. The passive crossover network divides the signal output by the power amplifier into different frequency ranges. Respectively give the opposite horn. The simplest frequency divider circuit is a capacitor in series with the tweeter. In the car coaxial speaker, the full-frequency music signal is output to the tweeter through the capacitor and the low frequency is filtered out.
In the simplest crossover network design, two speakers only need one capacitor to transfer high frequencies to the tweeter, and only use one inductor to transfer the mid and low frequencies to the woofer. The application of the three-way speaker is also very simple. As long as a capacitor is connected in series, the high frequency can be fed to the tweeter, a capacitor and an inductor are connected in series to give the midrange frequency to the midrange unit, and an inductor in series can be connected to the low frequency to the bass unit. As shown in the figure below, it is the first-order frequency divider we often say
The frequency divider plays a very important role in audio. Its function is to divide the full frequency band of audio into several frequency bands, so that different frequency bands are respectively sounded in the corresponding speakers (usually two-way and three-way are commonly used) ). Because the audible frequency of the human ear is about 20Hz to 20000Hz, and it is very difficult for a single full-range speaker to achieve this wide frequency, and the cost is very high, and the use of a frequency divider can solve this well. The problem, we only need to divide the speakers into several frequency bands to produce. Generally there are tweeters, midranges, and woofers. There are also some special-purpose speakers. Their frequency bands are usually made narrower, such as those used in subwoofers. The subwoofer is a subwoofer, and its frequency is generally limited to below 150Hz. If the crossover is removed from the speaker, the sound will be muddy and the sound field will be blurred.
The role of car divider If you add a crossover, you can directly add the sound of all frequencies to all the speakers. The woofer can withstand the high pitch, but the tweeter cannot withstand the bass. If the sound is slightly louder, it will burn the high pitch directly. Crossover The principle is to divide the input full-range sound into three frequencies: treble, midrange and bass, and then connect the speakers to each, so that the sound will be good. Can the home audio crossover be installed in the car shop?
Yes, but the speaker must match the crossover. Each crossover has its corresponding crossover point, so there must be requirements on the speaker. If it can be used with an independent car amplifier, it is better to use a home crossover. Power car divider and home divider
The home speaker has the same effect as the car speaker crossover. The home power amplifier has a transformer, 220V becomes low-voltage alternating current, and then it has to be rectified to direct current before it can be used for the power amplifier. Home audio also uses direct current, but you don't know it. The car does not need a transformer, and uses direct current directly. So it's all direct current, there is no difference at all. The car stereo bass is not good, because the speaker is too small, not the problem of the crossover. You connect the home bookshelf box to the car amplifier, and the bass is very good. Connect floor-standing speakers for better bass
The difference between the twoThere is a difference between home audio and car audio. Professional car audio should take into account the installation environment of the car. Driving noise, car vibration, noise outside the car and other factors; therefore, it is not recommended to install home audio in the car. If you are pursuing sound quality and have a budget, you can consider replacing it with a car audio. If you want to be the best, you can install 2 power amplifiers to push the front field, the back field and the bass respectively, but pay attention to adding a capacitor, and the wire should be better to prevent burning out the car power supply.
What are the main differences?Car speakers generally adopt a high Qts (total quality factor) value, low impedance, and high sensitivity design. Since the output power of the power amplifier in the car audio host is generally small, the low impedance and high sensitivity design are all for the speaker to output a higher sound pressure under the condition of low power driving. Household high-fidelity speakers generally adopt a higher impedance and low sensitivity design to obtain better sound quality.
The total quality factor Qts value is a relatively abstract concept, it is difficult to understand without professional knowledge, but it is also the most important technical parameter of the speaker, so we will briefly say that in this regard, car speakers and household and other professional There is a big difference in using speakers.
The Qts value of household (or professional) speakers is generally between 0.3 and 0.5. The woofers are installed on well-designed speakers to work. The internal volume and size of the cabinet, structure, sound absorption treatment, etc., in various aspects Will affect the working state of the woofer (the midrange and tweeter are basically not affected by these factors), no matter what structure the speaker is used (inverted, closed, horn, labyrinth, etc... Etc.) When the woofer is installed in the cabinet, its Qts value will change. The ideal design goal is to make the Qts value about 0.7, so that the best sound quality can be obtained. In the car, the space for installing the car speakers is very limited. At the same time, it cannot be used as a closed box or an inverted box. The impact on the working state of the speaker is difficult to predict. In this case, the Qts value of car speakers is usually designed to be higher, above 0.9. After installation, the total quality factor does not change much, but it is impossible to reach the ideal 0.7.
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