Tell me if I'm wrong but an extension cabinet is simply a wooden box with some speakers in it? Call me ignorant but what does an extension cabinet add to your live sound? I assume words like "dispersion" and "projection" will surface but if you are already using a powerful, high wattage amp (say a 2x12) what exactly is there to gain from using an extension cabinet? Let me give you a scenario and you tell me if my way of thinking is correct. Real life scenario: My band is playing an outddor gig and I am not being mic'd. Because I love the tone I am going to use a 15 watt Fender Blues Jr with a Crunch Box for my dirt. 90% of our music is harder edged blues and I don't need much if any clean headroom. Would an extension cab (1x12 or 2x12) help make the Blues Jr. sound "bigger" and help project the sound? Or do I need more watts to make it sound "bigger"