Many of my first-time friends don't quite understand how to make the speakers louder. I will answer them in detail in this small series. When it comes to the "loudness" of a speaker, many people seem to have a confused understanding of this concept. When it comes to volume, many musicians only consider the power and rated wattage of the speaker, and in general, the tile The more the number, the less the loudness is. But it is undeniable that Watt is still an important consideration. The power of the speaker is also an important factor affecting the loudness of the speaker.
Decibel and volume level
Decibel ("dB") is a unit of counting about the ratio between two numbers. Well, I understand that many people are not very interested in this, so I will simplify things and try not to involve "mathematics". Regarding the logarithmic scale, you can't just understand it in the usual way—for example, if you double the number, it will increase, but it doesn't mean "double". For example, 100dB is doubled by 50dB, but it is not It means that its "loudness" is "double" of 50dB. When it comes to "loudness", it involves the sound pressure level (also known as SPL). About 10dB of horizontal growth will make you feel loudness." Doubled. In other words, if a speaker capable of producing 90dB SPL is compared to a speaker capable of producing 100dB, most listeners will think that the second speaker has about twice the "loudness" of the first speaker.
Wattage, power and SPL
So how big is the wattage to get double loudness? Let us assume that if there are two speakers, one is 10 watts, the second is 20 watts. The wattage of 20 watts of power is another speaker. Doubled, but after conversion, double the wattage will only increase 3dB SPL. Remember, if you want to double the loudness of the speaker, you need to add 10dB to the speaker, while a 20W speaker It's twice the wattage of a 10 watt speaker, but it doesn't produce twice the loudness. The same is true for high-power devices. A 100-watt speaker doesn't produce double the "loudness" of a 50-watt speaker. The assumption is the same. The speaker will only increase the loudness of 3dB, although the volume change will be very obvious, but it will never double the loudness.
Speaker sensitivity level
The speakers in the speakers also have specifications for sensitivity and effect – they convert the input power into sound energy. Dynamic dynamic speakers (you can find it in most guitar and bass speakers) are very Inefficient, it converts most of the input power into heat, not sound. Normally, the sensitivity of the speaker is measured in the anechoic chamber (no reflection, soundproof room) and through a unit like this / format to describe: 90dB@1W/1m.
Translated, it means "90 decibels (SPL) and 1 watt of power, the sound pressure level produced by a distance of one meter from the speaker is 90 decibels." The sensitivity of efficient speakers will be higher, and vice versa. Effective speakers will have less sensitivity. Efficient speakers will make your speakers louder.
Although the power of these two speakers is almost the same (20 watts and 18 watts), the sound of the left speaker is louder due to the installation of efficient speakers.
Therefore, let's assume that there is a speaker with a sensitivity of 90dB @ 1W / 1m and a power of up to 100W. If we adjust the power of the speaker to 1 watt, then at a distance of 1 meter, it will produce 90dB. If we adjust the power to 2 watts, then the SPL measurement will become 93dB. If we increase the power of the speaker to 10 watts, then the SPL measurement will increase to 100dB. At this time, the loudness will be generated compared to the previous 1 watt power. Double the effect. So, in fact, they need more than 10 times the power to make us feel the loudness doubled. Since this we imagined the speaker with a maximum power of 100 watts, we can double the volume again, from In theory, power above 100 watts will produce 110dB SPL.1 watt = 90dB.100 watts or more than 100 watts power = 110 dB. This is a huge power increase, but you can only feel four times The volume level is growing.
As you can see, if you want to get the "double" volume effect, you need to increase the power and the wattage of the speaker. Let us introduce the sensitivity/efficiency of the speaker into this formula. If we will be 90dB @ 1W / 1m The speaker is replaced by 100dB @ 1W / 1m, and its digital change is very obvious. We know that the input power of 1 watt will provide us with 100dB SPL. Remember, the first speaker needs 10 watts of power to achieve the same The volume! Therefore, installing an efficient speaker will give us a higher volume. Similarly, it is also suitable for the maximum power handling of all speakers. Assuming 100dB @ 1W / 1m speakers can handle up to 100 watts, then it can Provides up to 120dB SPL; the maximum level of 90dB @ 1W / 1m 100W speaker doubled volume is only 110dB SPL.
Speaker power + speaker efficiency and power handling capacity = maximum volume
So keep in mind that increasing the power of the speaker will make it louder. Increasing the sensitivity of the speaker will give the speaker more power in the available power range. So this also means that the loudness of any speaker can't. Judging by wattage only. You must know the power handling and sensitivity of the speakers, etc. These are important factors that can make the speaker louder. If your 15 watt speaker is equipped with a relatively inefficient speaker, but its The loudness is enough for your requirements, so you don't have to buy a high-wattage speaker – you just need to replace an efficient speaker, such as the Electro-Voice EVM 12L (Figure 2), to do just that. Needlessly, there is no need to replace the entire speaker. Similarly, you may not need a 100-watt speaker; if you replace the 95dB @ 1W / 1m speaker in a 50-watt speaker with 101dB @ 1W / 1m, they are at the volume level. There are very obvious changes, you need to accept.... In fact, when using inefficient speakers, 100 watts or even 50 watts are louder.
Replacing inefficient speakers with high-efficiency speakers, such as the E/V EVM 12L, will make the speakers louder.
Of course, if you really want to make the speakers louder, then you need to have a speaker with high power, efficient speakers and power handling. More home theater audio knowledge in China's home theater network, official WeChat: cnhifi.
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