This may be a stupid question but I've poked around a bit and can't quite find an answer. I have a Markbass Mini CMD 121P combo amp and I'm thinking of adding a second cab to it. The description on the guitarcenter website says "you can hook up to another 8 ohm cab for a 500W rig." My question is, does this mean that the whole system will total 500W (300W [normal for the amp] + 200W for the cab), or that it will send 500W to the cab? I'm thinking it's the second but I figured I would make sure before getting a cab. Better safe than sorry. Thanks!