I have a Rumble 100 and I'm looking to upgrade to something a bit louder I went to a music store and tried out the rumble 100, 200, and 500, but, I couldn't actually hear a noticeable increase in volume between the three, maybe a slight increase between the 100 and 200, but nothing much. (also my apologies for testing all of your bass amps with the master volume maxxed out, I hope I didn't ruin the structural foundation of your building) Am I mishearing? Is there really a larger difference between these amps that I'm missing? I know that the 200 and 500 have tweeters, but I turned them off for the sake of the comparison. I know you can buy a $300 1x15 rumble extension cab. Might it be more worth my money to buy a light 600 watt class D amp and a light cab like the rumble 115 600W? Are there better lightweight cabinets out there near that pricepoint?