Hi everyone. After reading numerous posts about how much you guys love your SVS, I decided to maybe consider upgrading my 12" JBL powered sub. I am really not too happ with the sub i currently have b/c it just doesn't make me feel the bass at all and it sounds terrible with music. Would i hear a noticeable difference if i got an SVS sub? I live in an apt. so i have a small living room and I was wondering whether or not it would be a problem? The sub i was looking at getting was the 25-31 or the 20-39 PCI. Any feedback would be great. thanks.