Please advise on the selection of speaker amplifier modules

悠游自如

Please advise on the selection of speaker amplifier modules [Copy link]

I have two speakers, marked 8Ω 5W. I did find such modules, but they are basically powered by 5V. Since the 5V output current is too low here, I want to find a 12V powered, 5W 8Ω module, but I can't find it. I want to ask if it is okay to use a 12V powered, 10W output module? Will it cause the speaker to heat up seriously? Or is the output power only the maximum power, and the actual power is still based on my speakers?

maychang

The "module" you are referring to is probably the power amplifier module.

How much power the speaker gets depends on the size of the input signal. If the input signal is zero, the power the speaker gets is obviously zero.

The maximum power that a speaker can obtain depends on the maximum voltage (related to the power supply voltage) and the maximum output current that the power amplifier module can output, and is also related to the speaker impedance.

maychang

"I would like to ask if it is OK to use a 12V powered 10W output module? Will it cause the speaker to overheat?"

If you are worried about the speaker heating up too much, just turn down the volume. Usually, such a power amplifier module will not burn out the speaker.

chunyang

When using a 10W amplifier to drive a 5W speaker, it is sufficient to control the actual output power not to exceed 5W. Of course, it does not matter if it exceeds the rated power of the speaker. If it does not exceed the rated power of the speaker by a large amount, the heat generation is not a concern. The speaker is different from other components in this respect.

Too high a driving power will cause the speaker to be unable to withstand the strong mechanical vibration, and the first thing that will appear is distortion. As the driving power increases further, the distortion will gradually increase, and the sound quality will seriously deteriorate when it hits the bottom. This will cause irreversible damage to the structure in the long run. Only when the driving power is high enough will the voice coil burn out due to heat, but before that, the paper cone structure will be destroyed, unless the driving power is large enough in a transient state.

The nominal power of a speaker refers to the maximum power that can guarantee sound quality. The actual power that the voice coil can withstand is much larger than the nominal power, but it does not have much practical significance. After all, sound quality is the premise.

悠游自如

chunyang posted on 2022-9-27 11:58 To drive a 5W speaker with a 10W amplifier, just control the actual output power not to exceed 5W. Of course, it doesn't matter if it exceeds the rated power of the speaker...

Thank you. I roughly understand that the power amplifier amplifies the current of the output audio to vibrate the speaker.

maychang

Youyouziru published on 2022-9-27 13:57 Thank you, I roughly understand that the power amplifier amplifies the output audio current to vibrate the speaker

There is a situation that may burn out the speaker: the power amplifier output has a strong DC component. At this time, the speaker has no sound, so it is not easy to attract the attention of the user. For example, if the DC voltage at both ends of your 8Ω 5W speaker reaches 10V, it will burn out after a long time. If your power module uses a single power supply and the large electrolytic capacitor connected in series at the output end is short-circuited, there will be a phenomenon of DC voltage at both ends of the speaker.

chunyang

Youyouziru published on 2022-9-27 13:57 Thank you, I roughly understand that the power amplifier amplifies the output audio current to vibrate the speaker

The voltage will also be amplified, and the level of the general signal source is on the order of hundreds of millivolts.

悠游自如

maychang posted on 2022-9-27 14:45 There is a situation that may burn out the speaker: the power amplifier output has a strong DC component. At this time, the speaker has no sound, so it is not easy to cause use...

Thank you. I am currently just planning to test two small speakers. I will then gradually increase the volume to see the effect.

wangerxian

You can share the results after the test~ Looking forward to it!

悠游自如

wangerxian posted on 2022-9-27 16:56 You can share the results after the test~ Looking forward to it!

OK

悠游自如

Finally, I tried it and found that both 5V and 12V can be used. There is no problem as long as it does not exceed too much. . .