Note to newbie's from another relative beginner. I've had my DB for a year and half. I have been playing with the cheap fiberglass Glasser bow that came with the bass. I'll get a decent one some day. I was having slowing increasing trouble getting the strings to speak while bowing. After reading the various posts here (I'm on temporary hiatus from lessons for time and $ reasons) I tried the suggested fixes. First I loosened the hair a bit which helped. Then I switched from Pop's to Carlson's rosin which helped. I was getting frustrated and questioned my technique, my bow, my strings, my rosin. Finally when the bow just wouldn't grab in the middle third of its length it dawned on me... Maybe it's the hair? Just got the bow back from the luthier with new salt & pepper hair. What a revelation! Never even touched the rosin to it and the thing just grabs like crazy. I can do things I couldn't come near to doing before. I guess it's like when your car's brakes slowly fade - you just adjust - and when you finally get a brake job you realize how bad things had gotten. Bottom line, don't hesitate, re-hair.