Hey there. I am looking at an amp that says on the back (under the 2 jacks for the cabs) "300 watts at 2 ohms). I have 1 - 4x10 8 ohm cab. How many watts will that be with that one cab at 8 ohms? Also, if I hook up an aditional 8 ohm cab (to make the load 4 ohm) how many watts will that be at 4 ohms?