Hi! This is my first post here and I hope someone can help me. Im looking to replace my Sony SA-WM200 subwoofer with a bigger more powerful one. It came included in a HT-in-a-box so its not very strong. 20cm cone ( 8 inch I guess) 50W 28 Hz-200Hz Im willing to pay $200 (half the price of my whole system!) to give it a boost. My room has a lot of open space with only three walls. One side is just a rail overlooking the downstairs. I just want something that will give my theater a nice powerful rumble. (Im one who cranks up the volume for a great explosion!). Any advice will be much appreciated!