Err, use them! Breaking them in just means the components have had a signal running through them. If it's that important to you, just attach them to a Walkman or something, and leave it playing for a while each day, though it'll naturally happen anyway while you're mixing.

To break mine in I knida did the same thing. I filled my CD changer with classical music and some bass heavy music, and let it play for two days. The only thing you should not do is blast music into them, until they have been broken in.

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