1. What is the power of the speaker?
As the name implies, the power consumption of the speaker means that “the input speaker will not be damaged if it does not exceed the indicated power, and it will be able to withstand itâ€.
There are several ways to express the power of the speaker, which can easily cause misunderstandings by the user, resulting in damage to the speaker caused by improper use. Some of the parameters of the speaker are marked with rated power, that is, long-term power, indicating that long-term use will not be damaged under this power state.
The factory test rated power is based on a pink noise signal for 48 hours at a constant temperature of 20 °C. The use environment in KTV rooms is rather harsh, and the music contains many large dynamic peak signals. It is recommended that the input power is less than 20% of the rated power. It is safer to use the speakers.
The speaker's tolerance to peak power is conditional. The time setting is 1 second, and it can only be repeated 10 times. If it exceeds, it may be damaged. For the speaker with peak power, please use it carefully. It is recommended that the power not exceed the peak value. 1/4 of the power.
2. What is the rated output power of the amplifier?
The rated output power of the power amplifier refers to: "Long-term output power under undistorted conditions (generally, the output distortion does not exceed 1%)". In this state, the power amplifier works safely and reliably. In fact, there are several preconditions here: First, the mains voltage is required to be 220V. If the mains fluctuates, the output power of the amplifier will change accordingly; the second is the impedance specification for the load (speaker), for example 2 *150W (8Ω) power amplifier, the output power will reach 230W in the case of 4Ω load; the ambient temperature of the three factories in the output power test of the power amplifier is 20 °C, if the heat is not good when used in the KTV room Even if it is working under rated power conditions, it may damage the power amplifier; the rated power of the four power amplifiers refers to the undistorted output power, not to say that the power amplifier can only output this power, if the power distortion is also increased, the output is increased. The large volume knob), the output distortion power is very large, far exceeding the rated power. For example, the maximum output voltage of a 150W (8Ω) power amplifier that is not distorted should be less than 35V (power = voltage 2 / resistance). When the distortion, the output voltage may rise to 40V, then the distortion power will reach 402/8. =200W.
3. How should I match the power when I choose amplifiers and speakers?
When selecting amplifiers and speakers, we recommend that the power rating of the amplifier should be slightly larger than the rated power of the speaker. The general size is 20-30%, and at the same time, it must be equal. It must not let the power rating of the amplifier be less than the rated power of the speaker. cart". The small horse-drawn cart will cause the bass performance of the whole system to be weak and weak, and the dynamic and musical performance levels will be worse. If the user excessively increases the bass pitch knob or the volume knob, the output distortion will be successfully generated. Pedestrians often say "clipping", resulting in DC output (normally, the output waveform of the power amplifier is an alternating current sine wave, which will "clutter" to form an approximate direct current). In the case of DC output, the power amplifier can not control the speaker, it will burn. When the power of the power amplifier is greater than the power of the speaker, it is necessary to control the output of the power amplifier not to be too large, so that the power amplifier has sufficient "power reserve", and has good dynamic performance without damaging the speaker.
4. Why do you often "burn the tweeter"?
The tweeter is the weakest link in the speaker. When there is damage to the speaker, the tweeter is often damaged first. Of course, the woofer will be burnt if it is used improperly. When designing the speaker, the factory generally retains a certain margin under the premise of rated power. After we visited a large number of users, we found that the vast majority of "burning speakers" were caused by improper use, mainly in the following aspects. :
1) The power of the speaker and amplifier is not properly matched.
Some customers have chosen a 2*200W (8Ω) power amplifier to match the CS-450A speaker with a rated power of 120W, and the impedance of the speaker is 6Ω. When the power is placed at a full power output without distortion under 6Ω load, it has reached 250W. The actual power allocated to each tweeter is 25W, which has exceeded the rated power of the tweeter, causing damage to the tweeter. The actual output power of the power amplifier can be measured by the customer: the power amplifier is correctly connected to the speaker, the power amplifier volume knob is turned on, the voltage at the output of the power amplifier is measured with a multimeter (the hands will swing, the maximum value is taken), and then the measured voltage value is used. The squared value is divided by the impedance value of the speaker to obtain the output power of the power amplifier at this time. Interference, but must be used to face the microphone, and should be close to some, generally 2 to 100px distance, if it is too far away, or not right, it will cause "input is not enough", especially the bass loss It will be great. Ordinary entertainment guests may not have these "professional knowledge", and they do not know that they use it improperly and complain that they are tired of singing. To solve these problems, we must teach our waiters to help the guests, but the method must be appropriate. Don't blame the guests. It is best to hang a prompt on the wall to use the microphone correctly.
2) Improper opening and closing operations.
In some karaoke establishments, the waiter turns on the power amplifier (and the volume knob is turned on) and then turns on the sound source (VOD or DVD). When the power is turned off, the sound source is turned off first, then the power amplifier is turned off, and some are turned on in the power amplifier. In the state, the microphone cable is first inserted into the power amplifier, and then the microphone with the switch turned on is inserted into the connector of the cable. As a result, a strong impact current is generated, and the speaker emits a strong "beep" sound in an instant. Due to this momentary impact, it is entirely possible to damage the horn. The correct operation method is as follows: first turn on the sound source and then turn on the power amplifier when turning on the power. Turn off the power amplifier first and then turn off the sound source. When the microphone is inserted into the power amplifier, make sure that the microphone is connected with the connection and ensure that the microphone switch is off.
3) Connection failure.
The connection fault is also the culprit of "burning the horn". If the signal source to the power amplifier's signal line is grounded (sometimes the ground wire is not in good contact, the time is broken), it will be successfully produced to produce "high frequency self-excitation", and the light is burned. , retest the burning power amplifier. Sometimes the microphone line is not in good contact with the microphone (mostly the card is loose), or the microphone head is not in good contact with the amplifier, or the microphone is disconnected from the ground (single-core broken shield), which will cause a strong impact. The speaker is very strong. The "card......... card burst sound, this will also damage the speaker in a moment. There are many users making their own microphone line error, causing the microphone "ground line", which not only causes a lot of noise in the system, but also Damage to the speaker, if it is a double-core shielded cable, the correct method is the "2" of the red wire connector, the "3" of the white wire connector, the "1" of the shielded cable, the 6.35 hammer The end of the red wire is connected to the core, and the white wire and the shield wire are connected to the outer casing. If it is a single-core shielded wire, the core wire is connected to the "2" of the card head, and the shielded wire is connected to the "1" of the card head. The "3" and "1" are connected.
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