What does the speaker power mean?

[Home Theater Network HDAV.com.cn] What is the speaker power

Speaker output power refers to the maximum power that the home theater set can emit sound.

"nominal power", also known as "nominal output power". "Output power" Interpretation in the academic literature: For other electrical appliances, the nominal power, also known as the nominal output power, refers to the maximum output power that can be operated for a long time without distortion of the appliance. The maximum power refers to the maximum instantaneous power without damaging the electrical appliance, that is, the maximum load capacity that the electrical appliance can withstand. Output power = input power - power without work.

There is no direct relationship between sound quality and power. The power determines the maximum sound intensity that the speaker can emit. It feels like how loud the sound from the speaker can be.

According to international standards, power is marked in two ways: rated power (RMS: sine wave rms) and instantaneous peak power (PMPO power). The former refers to driving an 8Ω speaker within the rated range to specify the waveform continuous analog signal, the maximum electric power of the speaker without any damage after a certain interval and repeated a certain number of times; the latter refers to the maximum power that the speaker can withstand for a short time . The US Federal Trade Commission set the standard for power calibration in 1974: driving an 8Ω speaker load with two channels, and measuring the effective wattage when the harmonic distortion is less than 1% in the range of 20 to 20000 Hz, which is the amplifier's Output power, the indicated power is the rated output power. Usually, in order to cater to the consumer psychology, the merchants mark the instantaneous (peak) power, which is about 8 times of the rated power. Therefore, when purchasing a home theater set, the rated power shall prevail.

The power of the speaker is not as large as possible. The best is applicable. For a room of 20 square meters for ordinary household users, the true 60W power (the effective output power of the speaker is 30W x 2) is sufficient, but The larger the reserve power of the power amplifier, the better, preferably more than twice the actual output power. For example, if the output of the speaker is 30W, the power of the amplifier is preferably greater than 60W. For the HiFi system, the power of the amplifier that drives the speaker is very large.

How to view speaker power

There is a frequency dividing circuit inside the finished speaker. In order to balance the high and medium bass, the high and midrange speakers are not damaged at the high power output, and the resistors are generally protected on the frequency divider.

The power of the speaker unit is generally the power of the woofer. For example, if your woofer power is 60-120W, then the power of this speaker can be regarded as 60-120W.

For the problem of power amplifier: The specific standard of power amplifier and speaker power configuration should be: under certain impedance conditions, the power of the power amplifier should be greater than the power of the speaker, but not too large. The undistortion rate of the amplifier in general application places should be about 1.2-1.5 times of the rated power of the speaker; in the case of large dynamics, it should be about 1.5-2 times. In this way, the power amplifier will have a certain power headroom to avoid the situation of small horse-drawn carts. In summary, your pair of speakers is equipped with an output impedance of 4-8 ohms, and the output power is 250W-300WX2. In use, be careful not to open the volume too much, otherwise it may damage the speaker.

The last tip is: If the power of your woofer is the rated power, the output power of the amplifier is also matched according to the rated power.

Measuring electric power by voltammetry:

Equipment: two batteries, one switch, voltmeter (voltmeter), ammeter (current meter), electrical equipment to be tested (in this case, the speaker).

Connect the battery, speaker, switch, ammeter in series, and then connect the voltmeter in parallel with the speaker.

Close the switch, read the current value and voltage value (note the unit and dial scale), multiply the two values ​​to get the speaker power. (When reading, fast, read the number immediately to break the point, so as to avoid the speaker voice coil damage.)

Formula: W (electric power) = U (voltage) * I (current)

The power of the speaker is indicated on the speaker. The power of the amplifier can be calculated. The simplest: the voltage is multiplied by the current. For example, the power supply voltage of the power amplifier board is 26V, 4A, and 26*4=100W.

More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.