Okay I have yamaha bbt 500h amplifier with 2x10 matching cab. The amp can go down to 2 ohms and give 500 watts. (250 watts at 4 ohm). Right now I can't get much of volume, quite much but not enough. If I add another 2x10 I will gain: Double ammount of speaker surface. Double ammount of wattage. Easy to transport rig. The thing is, that I am afraid this not will be enough... Because I cannot try it. I can't know. But 500 watts into 4 10" speakers sounds enough to me. 2# choice: If I add a 4x10 instead: Much bigger ammount of speaker surface. Double ammount of wattage. Not very easy to transport. Help me and give advice on what to do. (What I feel right now is to go with the 1# Choice (2 2x10 cabs) Thank you!