I am looking to add a sub to my HT but would like to build one. Currently I have Def Tech BP2006TL's and and CLR2300 which all have built in 8 inch powered subs. They are more than ample but would still like to add a sub. Basically I want to the sub to be as small as possible while being able to add some serious bass. I guess my first question is how small of a driver can I use? And if I use a small driver will it have plenty of slam (is there where the amp comes in?). My living room doesnt have much space, hence my need for a small sub. I need to some getting pointed in the right direction as DIY subs are new to me.