I will only adress the silicone issue. I have used the 100 percent silicone clear bathtub sealer with great success. Read the last as: not the stuff which is partially laytex. I didn't know that it came in acidic or non acidic varieties. If the speaker doesn't buzz without the grille, why replace it? I don't believe that any aftermarket speaker of the same size will sound any better than the original if the original is not damaged. Tod

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