I noticed that my Avalon Eidolon (not Diamond) has brown and purple marks on both midrange speakers. Is it normal? What could have caused it? Does it effect sonic quality of the speakers?
Why not contact the company with that question? You could ask whether this would "color" the midrange, or whether the speakers would instead be expected to pass muster with flying "colors". :)
I do not have those on mine (6 months old) but read here on AgoN that it is normal. Discolorations apperar over time and do not influence the sound quality.
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