I recommend playing mp3's or a mini disk player through it, for 15 minutes on ~MAX but do it in the middle of the day, and make sure the music has lots of low and high frequencies in it, especially bass heavy stuff really loosens the speaker cone. Recently did this with my Celestion G10 and it's all it's needed, totally broke in now, but be warned it was ultra loud, and thats with a 60 watt speaker, so 100 will be LOUD! try putting it face down onto a bed, so it makes less harsh noises, or build an aneonic chamber, with 8 foot thick walls.