Is the TDI DF coil just a compromise? A 12" and a 5" (5 + 12= 17 / 2 = 8 1/2). Wouldn't a 8 or 9 inch coil give approximately the same performance? It doesn't seem to have the depth of a 12" mono or the sensitivity of a 5". Inquiring minds want to know. Thanx, /http://www.findmall.com/read.php?73,1572515,1572515#msg-1572515Sat, 25 May 2013 03:19:02 -0500 Phorum 5.2.18 http://www.findmall.com/read.php?73,1572515,1573747#msg-1573747 http://www.findmall.com/read.php?73,1572515,1573747#msg-1573747 Hobo lobo Whites TDI ClassroomFri, 28 Oct 2011 22:29:00 -0500 http://www.findmall.com/read.php?73,1572515,1572515#msg-1572515 http://www.findmall.com/read.php?73,1572515,1572515#msg-1572515/]]> Hobo lobo Whites TDI ClassroomWed, 26 Oct 2011 21:28:10 -0500