No, I'm arguing that if a person describes the sound of his unplugged bass as being 'resonant' he is using a correct - and probably the original - definition of the word.
Per your original post: "This (electric) instrument resonates well!"
If the person is referring to the sound it makes, then he is correct.
I hate to indulge in argumentum ad dictionarium, but since you are disputing the literal meaning of a word, it's fair for us to use the OED, as it is the authority on the English language. It defines 'resonate' as:
1. Produce or be filled with a deep, full, reverberating sound.
‘the sound of the siren resonated across the harbour’
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That is the first - therefore, preferred - definition. It's also the one that most closely reflects the word's history/origin. In fact, it is very likely the original definition in English. The definition you are using - and the one that you are insisting is the ONLY definition - most likely came later. In any event, it is a technical definition.
I don't doubt you know what you're talking about when it comes to physics - you might well be an expert and I defer to that. That's not my area. But similarly, maybe you should at least acknowledge that you *might* not be an expert when it comes to the English language. If you were, you'd realise you were wrong. In fact, you don't need to be an expert on the English language to realise you are wrong.