Well, I can give you an engineer’s answer or a practical one, and I will attempt to do both. So one of the problems of being an engineer’s sister and I battle this all the time with myself is that we tend to take questions about subjects in a very literal manner. So if you ask me if it is possible to damage a speaker with high volumes and no distortion, the answer is yes it is.
Speakers are voice coils, and a voice coil that has too much current going through it over too long of a period can overheat and fuse to the gap inside of the speaker, and that will certainly damage it, and that is what the engineer in me is saying. Okay, here is your answer.
The more practical side of me says no, not really, and here is why. I assume you are listening to music and with that assumption music even if it is played loud as long as it’s not distorting and your speaker can handle that many watts aren’t typically going to overload your voice coil or heat it because the nature of music is I want to use the word sporadic. I am not sure that is exactly the right word; it is transient now, maybe that is a better word.
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So as you must have noticed (obviously), the music is, you know, bump bump bump bump bump bump every bump bump bump of four-bar music or whatever we listen to is only there for a little bit and while the voice coil will certainly heat up over time unless you are playing loud steady state tones through there, I wouldn’t concern myself over this.
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Now rock on baby-just crank that suckers up and enjoy it without worrying about damaging your speakers because most speakers stay within the limits of an amplifier’s power or the limits of common sense. If you are blowing your windows out or the speaker is distorting you are gonna have trouble but generally, you are gonna be okay. So enjoy the music without any worry. This article is brief, but I hope this one was enough to answer your question as well as ease your apprehensions.