These small speakers can be roughly divided into two categories.

(1) Active speakers.

Advantages: Simple, two cabinets, the power amplification components are all inside the speaker cabinet, the power switch and volume knobs are installed on the surface of the cabinet, and the price is low.

Disadvantages: Relatively speaking, the sound quality is poor. Reason: The speaker is vibrating, and the audio power amplifier component is afraid of vibration and expects quietness. They are a pair of opposites. The two cabinets are not symmetrical (one has an amplifier circuit), and listening to music expects stereo sound.

(2) Split sound combination.

Advantages: Compared with active speakers of the same grade, the sound quality is better. It is characterized by two cabinets and one amplifier, and the electrical safety is good.

Disadvantage: high price. Reason: The power amplification components are put into the metal shell separately, which increases the cost.

At present, many mini-combo stereos have the functions of CD player and radio, and the price is higher.

Usually the lowest performance frequency of the audio system can be selected above 40hz, of course, this is for only one unit per speaker. If each speaker can guarantee two units, then the sound effect will be much improved.