Hi all, I just have decided to start looking into DIY and i found this site. I have a few questions if anyone can help me out. I have bought some HT equipment since i've started getting into it. Nothing to good, but enough to catch the HT bug. I am in college so i have a budget, so it made DIY all the more appealing. I do have some questions though. I have klipsch bookshelf speakers for now that provide clean decent mids and highs, but i need some bass for my system. Eventually i do plan on building new speakers to replace the klipch ones, but for now, i'm most interested in filling out my bottom end. I plan on buying an adire shiva driver. What i want to know is, if a bottom firing sub is really the way to go? The more expensive ones i've seen are like this and i just would like to know why. Also, what would be the best material to put a down firing sub on. (as is, it would be a on tiles, but i could always get a rug or something) I'm planning on buying a 250 watt plate amp from parts express (part number 300-793) and i was wondering if this would suffice, not only in my tiny dorm room, but when i move off campus as well. I want this thing to be loud, but cleanliness and tight sound are more important (why im going with sealed) Finally, I have read about needing to build a crossover for the subwoofer, but in my case i wouldn't need to do this because the amp has an x-over built in right? Whether this is true or not, could someone also tell me when its necessary to install a crossover yourself. Like is it just if you are powering a speaker from a receiver and don't have a power amp? Sorry for the load of questions, but if anyone could help me out, it would be great. Thanks in advance guys!