1 Measure the horn with a multimeter: use R×1Ω gear, with one stylus connected to one end and the other stylus touching the other end. Under normal circumstances, it will make a crisp "beep" sound. If it doesn't ring, the coil is broken. If the noise is very small and sharp, there is a problem with wiping the coil and it cannot be used.
2 Try to measure with 1 ohm. It is good to have noise in the horn, but it is bad to have no noise or resistance. The resistance of the horn is very small, usually only a few ohms, which can be ignored. If the measuring horn has noise, but it is not sound, it is unqualified.
3 Set the meter to 1 ohm and set it to zero. According to the nominal impedance of the horn, the measured results show that the DC resistance is about less than the AC impedance, and it is good to hear a "click" at the same time.
How to quickly judge the quality of speakers?
There are many kinds of speaker faults, such as open circuit and short circuit of coil, loose coil touching coil or voice coil stuck. When the coil is open, there is no sound output, and when the coil is short-circuited, the output sound is small, and the power amplifier is seriously heated. The output sound of the loose ring is hoarse and light. The output sound of the collision ring is knocking sound. The clamp spring has no sound output, and the output current of the power amplifier is very large.
How to Measure Horn with Multimeter
The method of measuring the horn with a multimeter is:
Set the multimeter at RX 1, then touch the two terminals of the horn with two probes, and then observe the measured resistance and the sound of the horn. Normal, when the horn touches, it will make a loud "click" sound, with a certain resistance value, which is smaller than the impedance value of the horn;
If it is found that there is no sound when touching the horn, the resistance is infinite, indicating that the coil inside the horn is open;
If it is found that the horn rings when touched, but the sound is very small, but the resistance value is basically normal, indicating that the horn may be stuck in the ring;
If the coil is open or touches the coil, replace or repair the horn before use.
How to judge the quality of speakers
Undeniably, in the history of the development of audio equipment, speakers have always lagged behind power amplifiers and sound sources. As far as the current technology is concerned, "high fidelity" can only be a relative "high fidelity". In the whole set of equipment, the biggest distortion is the speaker. The vibrating basin of the horn generates air vibration under the current of the power amplifier, so we hear the sound, but the movement of the vibrating basin produces higher harmonics, which causes serious distortion to some short sounds, which is called transient distortion. Relatively speaking, the transient response of bookcases is obviously better than that of floor-standing speakers, but the disadvantage of small bookcases is that the strength and momentum of playing back music are far less than that of floor-standing speakers. Therefore, some floor-standing speakers often use several small-sized speaker units instead of a large-caliber speaker unit to integrate the advantages of small bookcases and floor-standing speakers, learn from each other's strengths and improve the quality of sound playback. The quality of the power amplifier directly affects the playback quality of the speaker. Experienced enthusiasts often build a complete sound system according to the selected speakers (like the foundation of a house) just like building a house, which is not only scientific and reasonable, but also saves a lot of detours and saves the cost of changing machines. In the middle and low price range, bookcases have become the first choice for many enthusiasts because they are easier to control and suitable for the listening environment of ordinary families. Theoretically, if the listening area is less than 20 square meters, it is better to choose a bookcase, because I have to consider the standing wave reverberation of the room. If the speaker is too big and the standing wave is heavy, the reproduced sound will be chaotic. If the listening area is more than 20 square meters, you can consider a floor-standing box or a large bookcase. No matter how big the room is, the sound absorption characteristics of the room sound should be considered, and the acoustic treatment and swing of the room should be done well, which is the basis of beautiful sound.
Almost every speaker manufacturer has its own style and sound base positioning. British speakers are soft and pleasant, and the connection of each frequency band is relatively balanced, which is suitable for most consumers' listening habits. American speakers are enthusiastic and bold, and the sound base is tough and bright; French speakers are famous for their luxurious sound base and excellent air sense, while Danish speakers are loved by enthusiasts for their high definition and high density. When buying speakers, you should buy those well-known brands, such as the common British mission and B&; W, Spando (Spanda), Tianlang (Tianlang), AE, Wo Fei Da (Le Regal), Chu Qing (After Rain), etc. American JBL, British finidi, Tyre, etc. , French Triangle, Jmlab (Strong Wave), Danish Dynamo Jamo (Zunbao), Canadian Mirage (Milac), Energy and so on.
Domestic speaker products have different styles. Well-known brands include hivi, Shenzhong, Hewlett-Packard Cyclone, Ho's, Australian Whale and so on. The speakers of these manufacturers are generally reassuring in quality and technology. Friends who support domestic products can pay more attention to the products of these manufacturers.
Pay attention to an index problem when buying. In terms of rated power, the nominal power of general manufacturers is strict, usually "recommended power amplifier power". In fact, the power index of the speaker is of little reference value, while the sensitivity is marked when the power amplifier outputs the sine wave signal of 1W power 1KHZ. The sound pressure value obtained one meter parallel to the speaker is generally 86 dB-a civilian product. The higher the sensitivity, the easier it is to drive, and the higher the sound pressure series obtained at the same power.
The impedance of the speaker is in ohms. Usually, the lower the impedance of the speaker, the harder it is to push. The output voltage of audio equipment will change with the change of load impedance. In fact, audio equipment with high output impedance outputs less current than audio equipment with low output impedance. When the electronic tube machine is connected to the power amplifier of the sound box, the sound box whose nominal impedance is equal to or close to its output end should be selected, while the transistor power amplifier has no such restriction and can be connected to the sound box with any impedance. For low-priced speakers, it is recommended to choose speakers with impedance of 8 Ω or higher. Theoretically, the center and surround speakers should be exactly the same as the main speaker, but considering the actual situation of ordinary consumers, if conditions permit, I suggest you choose the center and surround speakers with the same brand as the main speaker.
How to judge the quality of speakers
If you can see the terminals, find a dry battery, and then use two wires, one connected to the battery positive electrode and the other connected to the battery negative electrode, and then use the other two ends of these wires to contact the two terminals of the speaker respectively. At this point, the center speaker sounds "card, card", indicating that the speaker is good, silent and broken.
Can a multimeter measure the sound box?
The multimeter is set at the "ohm" position, and the two probes are respectively connected with the two leads of the horn. If the measured resistance value is equal to zero or very small, it means that the coil of the horn is short-circuited; If the measured resistance reaches infinity, the horn is disconnected.
The normal resistance of the speaker is 4, 8, 12 or 16 ohms.
How to judge the quality of a speaker with the naked eye?
The naked eye can only judge the appearance, but the coil in the magnetic column can't, but you can try it with a multimeter or battery.
How to measure the quality of sound box with multimeter
Ask a friend: generally use the resistance of multimeter to measure the resistance at both ends of the horn. Normally it is about 8- 16 ohm. If it is infinite, the coil inside the horn is damaged.
How to measure the quality of loudspeaker with digital multimeter
Fetion users are right. But the lead of the horn is not divided into positive and negative poles.
The universal float is set at the "ohm" position, and the two probes are respectively connected to the two leads of the loudspeaker. If the measured resistance value is equal to zero or very small, it means that the coil of the horn is short-circuited; If the measured resistance reaches infinity, the horn is disconnected.
The normal resistance of the speaker is 4, 8, 12 or 16 ohms.
How to measure the quality of speakers?
The horn is good, starting from three aspects!
First, the appearance,
Second, the quality of materials.
Third, the performance of frequency response curve (this can only be tested by professional software, which is necessary for audio factory or loudspeaker factory)