I would like to build a sub using a Quattro 15 and a rythmik 250w plate amp or a PE bash 300 for use in a 8.5x10 room. The room is completely closed on all sides. I will use it for 90% HT/gaming and 10% music. I would like it to hit 20 hz with some authority without being boomy. Since reading about "room gain" I can't decide on vented or sealed. I couldn't find any info on this setup in a very small room. Because my room is so small does anyone think I would benefit from a sealed enclosure? With a 200w input at 2m WinISD shows 97db at 20hz and 109db at 80hz for a 2.5 ft^3 sealed enclosure. Would an LT correction circuit help my low end in this application? Could "room gain" boost my lower frequencies? The response of a 5.5 ft^3 vented box looks much better: 109db at 80hz and 104db at 20 hz. But, I have been told that "room gain" could make the vented box sound boomy and loose which I don't want. Using 1130/(2*longest dimension) I got 56.5 hz. Does room gain affect frequencies above or below that value? Is room gain really a substantial factor? Anyway, any opinions or insights as to which configuration would yield the best results in my room would be greatly appreciated. I know it's all a matter of personal taste that's why I asked for opinions. Thank you in advance for any information.