I purchased an Ampeg 6x10 cab. a little over a year ago and had been playing it with a GK Backline 600 head. Everything was running fine and then just this past January my speaker cones started tearing. First, the bottom left speaker tore almost all the way around. I called Ampeg and talked to a rep. who told me that my GK head was not allowing enough wattage to properly power the amp and so it was causing the tear. He agreed to send a replacement speaker under warranty and so I removed and fixed the problem. No more than one rehearsal later the bottom right speaker cone began to tear. Again, I replaced it and decided that maybe I should upgrade my head to something more powerful. I opted to buy the Ampeg SVT 6pro series head which powers at 1100watts. Loved the power of it and I could hear myself well. After one rehearsal yet another speaker has torn on me. This time the top left speaker. I am highly frustrated and don't know what I am doing wrong. I have never had problems like this before. Anyone ever heard of this happening or have any advice?