I'm thinking about buying a Markbass NYC 115. The cab is 8 ohms and rated at 400 watts. Now at 8 ohms my head puts out 300watts. But at 4 it does 500 watts. When I eventually add another cab to make it a 4 ohms load, would this be too much for the markbass 115 to handle? (I know this gets asked a lot, but it's better to be safe than sorry.)