How Long To Wait Until Unlocking The Bootloader?

I am expecting my Pure tomorrow. Normally the first thing I do is unlock the bootloader then root. After reading about the speaker issue, I am hesitant to do that.

Is there a good test for the speaker to see if the problem exists? Anyone return a phone with a bad speaker and an unlocked bootloader? Does it make a difference if I have or don't have the extended warranty?

Thanks!

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