1. Check the shape, color and size of the speaker
Selecting a speaker generally starts with the shape. If a multimedia active speaker is smooth and smooth, and the color is fine and uniform, it will give a feeling of heartbeat first. Then, on this basis, carefully check whether the joints of the speaker cabinet are even and tight, and the shape, the adjustment knobs and function keys, and the positions of the jacks are distributed properly. (Note: If you want to configure the subwoofer, the speaker must provide a subwoofer. The signal expansion port of the speaker is plugged in). In any case, you can’t let go of any nuances when you observe it, including the markings or patterns on the speakers. The exquisiteness, correctness and clarity show that this speaker is superior in workmanship and quality. If you are not at ease, open the speaker with the consent of the seller to see if the internal parts and wiring are simple and reasonable.
Check to see if the box is smooth and clean, tap the box, and the sound is strong and strong, and the sound distortion is small. Try to rotate and plug in the knobs, switches and jacks, you should feel less resistance and natural smoothness.
2. Estimate the maximum output power of the speaker
If a pair of speakers are selected from the process and shape, then you can take it and see if there are multiples, in order to estimate the maximum output power of the speaker. In general, the speaker’s undistorted power should be at least 20W+20W, which is 20W per channel.
The maximum output power indicated by the multimedia active speakers on the market today is PMPO music power, which is purely an advertising effect indicator, but should actually indicate the maximum undistorted power.
This power is only 1?8 of the PMPO power value. For example, a speaker labeled 160W may actually have less than 20W of undistorted power. Since more than 95% of the current multimedia active speakers are still powered by the AC transformer, we can estimate the actual maximum output power of the speaker based on the weight of the transformer and the amplifier board. In general, the 25W transformer weighs about 1 kilogram and the power is about 2 kilograms at 75W. Therefore, we can estimate the maximum output power of the multimedia active speaker based on the weight difference between the two speakers.
3. Check the magnetic shielding effect of the speaker
Since the color display is most sensitive to the interference of the surrounding magnetic field, the magnetic shielding effect of the speaker can be detected by simply bringing the speaker closer to the display. If the image is distorted when the speaker is close to the monitor, the magnetic shielding of the speaker is not good.
4. Feel the sealing performance of the speaker
Most of the current multimedia active speakers are inverted. There is a hole in the speaker, which is called the inverting port. The better the sealing performance of the speaker, the better the acoustic effect. To check this indicator, you can use your hand to close the inverted mouth when the speaker is working. When the sound is drum sound or explosion sound, there should be obvious air rushing out or sucking in the inverted mouth. Like the wind, the more obvious the feeling is. The better the seal of the speaker. The tightness of the speaker directly affects the low frequency response of the speaker.
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