When the subject of volume starts a parent/teenager blood feud, it is up to the parent to think straight, because the teenager sure as hell won't be. Besides, it kills two birds with one stone: the music problem and the birthday gift problem. Cheaper than a Cadillac, at any rate.
Teenagers rebel against authority: it's what they do, and nothing can change that. You can either present yourself as an even more imposing target or work the problem out like adults. Respect breeds respect, if you have brought up your child like that.
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