was in my mates studio today, and i noticed a big black sock hanging out of one of his monitors, seems he's employed the age old trick of putting a sock in the back of each monitor, and swears it helps with the bass response, i for one am a little miffed as to how, and why

can anyone enlighten me on this method? i've heard people discuss this in the past but never took any notice really, always sounded an odd thing to do