woofer

woofer n.  [University of Waterloo] Some varieties of wide
   paper for printers have a perforation 8.5 inches from the left
   margin that allows the excess on the right-hand side to be torn off
   when the print format is 80 columns or less wide.  The right-hand
   excess may be called `woofer'.  This term (like {tweeter}) has
   been in use at Waterloo since 1972, but is elsewhere unknown.  In
   audio jargon, the word refers to the bass speaker(s) on a hi-fi.