I know there a ton of sub placement threads, but I searched and didn't see this addressed specifically. I've got my SVS 20-39cs in the right front corner of my room. It's about 6 ft to the right of my right main, 11 ft from the center and 16 ft from the left main. It's a big room (L shaped 30 ft wide by 23 ft deep) Now that I've started listening to DVD-A, quite often I can easily tell where the sub is. I know corner loading a sub is supposed to give you some added volume, and I need it with this size room. Here's my question, how big/thick does a wall need to be to give a sub an added boost? If I moved my sub towards the middle of my front soundstage (still along that front wall) and set it next to say, a large bookshelf, will the side of that bookshelf act as another wall and the sub would still be considered corner loaded? Does this make any sense? If not, let me know and I will try to re-word.