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This is more of a technical questions but it relates to music practice, still, feel free to comment if you think it doesn’t belong here.

I bought a 6.3mm female 3.5mm male jack adapter and did the most naive/simple setup. Electro acoustic guitar->cable->adapter->portable speaker (jbl charge 3) And it works fine, my only concern is will this damage the speaker?

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Thanks in advance

  • Check the rated output impedance of your guitar against the rated input impedance of your speaker. 'nuff said. – Carl Witthoft Oct 25 '18 at 14:23
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    And how do they have to be relative to each other? The output impedance has to be lower or higher than the input impedance? – John Cataldo Oct 25 '18 at 14:28
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No, it won't harm the speaker at all. The worst that could happen is weak and/or distorted sound, but even that doesn't mean you're damaging the speaker.

I'm surprised you said it works fine, unless the guitar has some sort of pre-amp built in to get the signal up to line level. (My basses have passive pickups which are microphone level.) If that's the case then you could just as easily plug it into your computer's line in jack and have that work too.

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