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Active speaker introduction

2021-06-21 22
Active speaker introduction

Introduction of active speakers 1: The composition of active speakers can be divided into active and passive parts. The active part is mainly composed of power amplifier components and power transformers. The power amplifier component is used to amplify the music signal and realize various control functions, and the power transformer provides power for the power amplifier component. The passive part mainly includes speakers, crossovers and speaker cabinets.

Active speaker introduction 2: The speaker is the final sounding device of the entire audio system. At present, most active speakers use a moving coil design, which is simple in structure, low in cost and good in performance, but has different requirements for treble and bass. It is difficult to balance, so it is necessary to use two units for treble and bass respectively, which not only provide good sound quality, but also ensure the integrity of the frequency band. The playback frequency of the woofer is generally between 20 and 6000 Hz, and the aperture is mostly between 3 and 8 inches. The tweeter is generally small in size, with a playback frequency of 1500-25000 Hz, and a diaphragm diameter of 12-25 mm.

Active speaker introduction

Introduction to active speakers 3: The function of the crossover is to distribute the signal to the tweeter and woofer according to the frequency. High-level designers can also use the crossover to adjust the tone of the sound. Another function of the frequency divider is to prevent the high-power low-frequency signal from damaging the tweeter. Generally, low- and mid-range active speakers only use the simplest single-capacitor frequency divider, which is low-cost but inefficient, while high-end speakers are equipped with a real frequency divider that has been carefully designed and adjusted and composed of multiple components.

Introduction to active speakers 4: The main function of the cabinet is to prevent the occurrence of "acoustic short circuit" phenomenon. The phenomenon of "acoustic short circuit" means that the sound waves emitted from the front and back of the speaker are cancelled out due to the similar phase, which mainly occurs in the low frequency range. If the speaker is not installed on the speaker, there is no bass. The function of the cabinet is to isolate the sound waves on both sides of the speaker to avoid the phenomenon of "acoustic short circuit".

Introduction to active speakers 5: The combination of speakers, crossovers and cabinets is the top priority of active speakers and is the decisive factor in the sound quality of active speakers. For multimedia active speakers, this combination determines the sound quality of the speakers. 70% of the total.
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