I have been thinking about getting a new sub for a while, but I have not taking the jump because I have not been able to justify getting rid of something that is working OK...... However, I have been looking at these babies for a while, and now the sale seems to good to be true. My question is????? Would I really hear a difference? My sub v.s an SVS SB12-NSD or PB12-NSD What do you all think?